How It Was Supposed to End:
Here's why the alternate ending included in the Special Edition Die Hard With a Vengeance DVD is superior to the original, in three words: motherfucking rocket launcher.
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."