It's almost like a Tarantino scene, in that it's five solid minutes of two guys talking quietly, followed by one of them killing the other in the most laughable way possible.

It's also much darker than what ended up in the film: First of all, Simon actually gets away with the gold he stole, while McClane is fired from the NYPD and his pension is taken away. Like in the movie, McClane eventually tracks down Simon thanks to a bottle of aspirin Simon had given him earlier; unlike the movie, McClane also brings the aforementioned rocket launcher and insists they play a game of Russian roulette with it. Simon wins, and his prize is a rocket through the chest.

20th Century Fox
"All right, let's try best out of three."

So, you see, that's the "vengeance" from the title -- it's not Simon going after McClane for killing his brother two movies ago (he didn't give a shit about that), it's McClane taking his revenge on Simon for ruining his life. Also, this scene takes place on Christmas, McClane's preferred date for killing bad guys, according to the previous installments.

However, according to the DVD commentary from screenwriter Jonathan Hensleigh, the studio felt that this ended the character of John McClane on a bit of a bad note. McClane has killed a lot of dudes over the years, but it's always in self-defense or to prevent them from getting away. In this case, Simon already got away. This would be the first time McClane went out of his way to coldly murder someone, and the studio felt they couldn't allow it.

Because, you know, that would have ruined the franchise.

20th Century Fox
Yes, rocket launching vigilante McClane. Nothing could be worse.

Scott Pilgrim vs. the World is the instant cult classic (read: shitty box office but loud fans) by Edgar Wright based on a popular series of graphic novels (read: fat comics). Scott is in love with Amazon.ca delivery girl Ramona Flowers but must fight all seven of her exes in order to be with her, because that's how it works in Canada. In the end, Scott is victorious and finally wins her heart. What kind of movie would it be if he fought all those guys for nothing? Besides, that's how the comic ends.

Universal Pictures
And they lived happily ever after, assuming that's not a door to the dungeon dimensions.

How It Was Supposed to End:

Instead of Scott and Ramona getting together, Scott was actually going to get back with his disturbingly young ex-girlfriend Knives. On the DVD, an alternate ending can be found that goes pretty much like the theatrical one, except for the minor detail that Scott just stays with Knives while Ramona walks away alone.

So Scott Pilgrim is dating a high schooler, which is exactly where he was in his life when the movie started. Wouldn't that contradict the ending of the comic, though? Yep, but the movie was actually written before the final book in the series was made. Since the creator didn't even know how he was going to finish the story yet, the filmmakers just came up with their own thing. And their own thing, somehow, was "Scott doesn't end up with the girl he fought all those dudes for."

This is the ending that was written, shot, and edited. Another deviation from the comic involved a battle with a giant robot version of Jason Schwartzman, but this was scrapped because they feared it would look too much like Transformers (apparently you saw his robot balls). Edgar Wright discussed in an interview that test screenings did not go well with the original ending, so they reshot it to match the book. This is probably for the best, since the other one would have basically negated all the personal growth Scott had gone through (in this case, represented by a magical purple katana that comes out of his body).

Universal Pictures
Symbolizing the time in every young man's life when his penis turns purple and kind of burns.

Matt single-handedly stops the giant wave of water with his telekinetic powers and pushes it back into the dam. He's basically Superman with a potty mouth now, or a paler Hancock. It's not clear why the ending was changed, but it may have had something to do with the fact that the movie already had one sequence that cost as much as the rest of the movie combined, so another one would have been a little excessive. Also, why show the character becoming a superhero when you can just have him say to the camera, "Hey, I'm totally gonna become a superhero now, by the way"?

20th Century Fox
"Also I'm going to do a lot of expensive-looking stuff you'll never see!"

So what are the chances of Max Landis' Super-Matt and his rhyming "FUCK YEAH KOREA" catchphrase showing up in the inevitable sequel? Not many, since Landis got canned.

At the end of the film, there's a shootout between the members of the church and some federal agents led by Agent Keenan (John Goodman). Just as the confrontation is about to reach its bloody climax, some trumpets can be heard in the background. Pastor Cooper (Michael Parks) takes this to mean that the Rapture is happening and drops his weapons to celebrate. Of course, it turns out the trumpets were a hoax and Cooper is arrested.

How It Was Supposed to End:

If Kevin Smith had followed his original vision, this might have been one of the craziest endings in the history of cinema. Smith has said in interviews that his original script goes about the same way as the movie, until the trumpet sound -- that's when characters start exploding left and right as Agent Keenan covers his head and closes his eyes. When he opens them again, he sees the last member of the church "on the end of a gigantic sword held by a massive angel." The angel then drops the sword, looks at Keenan, and goes "Shhhh ..." And then, presumably, "... snootchie bootchies!"

Lionsgate
Foreshadowed by all the religious imagery and S&M.

Then the movie ends as the Four Horsemen of the Apocalypse descend on the planet. According to the documentary Kevin Smith: Burn in Hell, the whole concept of that movie was to make the story do a complete 180 every time it was becoming too predictable. However, since blood and giant swords are pretty expensive these days, this ending would have turned Red State into a "$4 million movie with a $15 million five-minute sequence." And, yeah, it would have been pretty awesome, but in a way we're glad Smith changed the ending, because the old one might have given Fred Phelps ideas.

Even the manliest among you can recount the story of John Hughes' star-crossed lovers, Andie and Blane: poor girl with a heart of gold meets rich guy with equally metallic internal organs. They experience resistance from their peers -- Andie's best friend, the perpetually platonic Duckie, and an impressively feathered James Spader -- but ultimately, love conquers all, even the smell of the sad, icky part of town. So, yeah, of course Andie ends up with Blane: That's the whole point of the movie, right?

Paramount Pictures
And they lived happily ever after, until a passing car sent them to the dungeon dimensions.

How It Was Supposed to End:

Nah, that's all bullshit, according to John Hughes. If he'd gotten his way, Andie would have stayed with Duckie, not Blane -- in Hughes' original script, Andie and Duckie arrive together at the prom, and at the moment where Blane should show up and talk to her, Andie starts dancing with Duckie (because this movie didn't have enough Jon Cryer dance moves). Then "Andie squeezes [Duckie] tight and lifts him off his feet." Freeze image, cue credits.

What about the whole thing about love crossing socioeconomic boundaries? That doesn't happen in life, says Hughes, so it shouldn't happen in movies either. Never mind the fact that Andie doesn't return Duckie's affections and explicitly says so throughout the entire movie. John Hughes' advice to girls wondering if they're not good enough for true love and thinking about settling for the nearest spaz who will take them is "Yes, yes you should." On the other hand, this would have been a great pre-emptive victory for Internet nerds who shout "friendzone!" at anything with boobs.

Paramount Pictures
He devotedly came to her house and studied with her. Of course he's entitled to some action.

So why the change? Apparently audiences had a problem with the leading lady making smoochy faces with her best friend instead of the guy who was painted as her romantic interest for the whole movie. A new ending was shot, and the band OMD had to write a new song for it in 24 hours ... accidentally resulting in their biggest U.S. hit. To give you an idea of how last-minute the change was, Duckie still gets the girl in the movie's novelization, since it was based on the script.

For more from Brendan, please follow him on Twitter. Read more from Amanda at Mannafesto, and if you're anything like Duckie, please tweet at her.

Related Reading: You know what classic movie has a really dumb ending? Star Wars. Before you take to the comments page, read about these classic films that nearly had dark endings. The Butterfly Effect originally ended with the main character's fetus strangling itself to death! Not impressed? Check out the most WTF game endings of all time.