The 5 Craziest Ways Famous Actors Got Into Character

... but absolutely no one caught on that he was Tom Cruise, even when he sat down and had an entire conversation with a total stranger.

"So what are your favorite Tom Cruise movies? Like, if I held this gun to your head, first three that jump to mind."

And yes, Cruise did actually take it upon himself to learn the other half of being a professional killer, i.e., how to actually kill people. He did extensive training with guns, learning how to shoot quickly and accurately, all with live ammo. He got so good that, on set, he was able to draw his gun and shoot helpless extras down in just under three seconds. Luckily, that time they used blanks, but we guess what we're saying is that if Tom Cruise ever decided on a change of career, "faceless killer" is totally in the cards. Incidentally, that's why we didn't make any Scientology jokes.

When a relatively unknown actor named Adrien Brody was asked to do a Holocaust movie, he probably knew that it was going to stretch the limits of his acting ability. When he learned that it was a Holocaust movie directed by Roman Polanski, he might have pooped a little. But although he'd yet to really show his Hollywood chops, Brody managed to win the Oscar for his role, making him the youngest actor to ever do so at the tender age of 29. The film also made him the only American actor who has ever received a Cesar, which is essentially the French version of the Academy Awards.

"Et le Cesar est attribue a ..."

The Preparation:

It's understandably difficult for any wealthy young American to get into the mindset of a Jew who has lost everything at the hands of the Nazis. In order to fully own the role of real-life Holocaust survivor Wladyslaw Szpilman, Brody had to understand what it was like to see his whole world collapse in front of him. To achieve this, he went ahead and actually gave up everything.

And we don't mean that he stopped getting his double-shot espresso delivered fresh every morning from Colombia via helicopter. He gave up literally everything. His cellphone, his fancy Porche, the freaking apartment where he lived ... he even went so far as to break up with his longtime girlfriend just so that when he cried onscreen, it was goddamn real.

"Maybe locking my entire extended family in that death camp was going a little too far ..."

We should also point out that Brody learned how to play the piano from scratch, so there's that, too. He memorized an entire Chopin piece, the one his character specialized in. So when you see him playing a beautiful four-minute piano piece, it's actually Brody's hands playing that tune. The finished film made Brody an overnight star. Of course, after his notorious Oscar acceptance, we can't be sure that the whole thing wasn't a giant scheme to hook up with Halle Berry.

"Everything has transpired as I have foreseen ..."

When he was making Saving Private Ryan, Steven Spielberg wanted to do a different kind of war movie. Rather than focusing on the heroics of our men in uniform, Spielberg wanted to get across the pants-shitting terror aspect of war. This unflinching portrayal of death and destruction was lauded for its ballsy approach to showing war as realistically as possible, and also for the intense performances of the all-star cast that included Tom Hanks, Matt Damon, and a pre-fame Vin Diesel. None of them knew what they were walking into.

The Preparation:

When push comes to shove, it's very difficult to act out a war onscreen because everyone knows in the back of their mind that all of the terrible carnage around them is really make-believe. You can throw around all the blank rounds and fake explosions you want, but at the end of the day, everyone's going back to covered trailers and warm cocoa. Spielberg's dedication to making the most realistic war film ever caused him to rightfully fuck all that noise.

And replace it with even more noise.

To prepare the stars for the "war is hell" mentality, Spielberg put his cast through hell. Almost every major cast member went through a 10-day boot camp with retired Marine Dale Dye, whose overall job was to absolutely wreck them until their hands were "like hamburger." Actor Edward Burns describes preparing for this movie as the worst experience of his life.

You can object that real-life soldiers have to live it for a hell of a lot longer than 10 days, but again, keep in mind that these people are used to eating their meals off of the abdomen of a nude Japanese woman. The level of culture shock is pretty hard to imagine. Dye would only refer to the cast by their character names, made them learn basic combat and survival techniques, and even shot at them with blank ammunition. God seemed to be in on the act as well, because on the very first day of field training, it rained like crazy, soaking everyone to the bone and turning the soft earth that they had to sleep on into mud. Eating only old canned rations and having a Marine screaming for them to move double time pretty much drove them to the brink, which helped them bring genuine mental and physical exhaustion to the screen.

Now, we did say that almost every cast member went through this training. Matt Damon, who played the titular Private Ryan, got to skip out on the horror, just showing up at the end of the whole thing with a cappuccino in hand and shooting his part in a mere six weeks. This was a deliberate decision by Spielberg, who wanted the dynamic between Damon and the rest of the cast to have a hint of animosity. After all, their characters spent two-thirds of the film just looking for this one punk-ass kid in the middle of Nazi-infested nowhere. What better way to get actors to act like they hate a character than to actually make them hate the real person playing him? Other than to, you know, just tell them to do it? Since they're actors?

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"Now, to get everyone really intense, Tom Sizemore's going to eat a box of kittens."

That's just the way Harris is -- he kind of has to live it. In A History of Violence, where he plays the villain, Harris wasn't one to let something like "not even being on set" take him out of character. While at a press conference for the movie, a reporter asked him, "What is violence?" His bafflingly furious response (in which he started pounding on the desk and flinging small objects) left everyone silent for a few seconds, thinking, "Shit, that escalated quickly."

And it's not like he's always going for an Oscar here -- while on the set of The Rock, one of the most Michael Bay Michael Bay movies ever, Harris was so mentally involved with his character that he simply refused to stop acting like a hardened, pissed-off war vet. Not only did he refer to Bay as "sir" at all times, but he even managed to make the other people around him refer to him in the same way. And while messing up a take can be frustrating for any actor, Harris absolutely lost his shit whenever he flubbed his lines. Not because he was just a big drama queen, but because that is exactly the kind of rage someone like his character would've had.

The real crazy part came after the ass-kicking scenes were shot. For four months, production on the film stopped so De Niro could focus on portraying the fatter, older version of LaMotta by becoming a fatter, older version of himself. During that time, he just ate himself silly, binging on meat, pasta, and anything else that would help him pack on well over 60 pounds of fat.

That's nothing compared to the brutal regimen Martin Lawrence puts himself through.

But perhaps the biggest bit of unreal dedication came with The Untouchables, where De Niro played infamous crime lord Al Capone. Playing the Chicago kingpin called for De Niro to gain weight once again, but he outright demanded that every physical detail of his character be authentic. He had a tailor in Little Italy craft him a handmade wardrobe of Prohibition-era clothing, right down to the silk underwear that Capone would have worn while beating guys' heads in with a baseball bat. This despite the fact that said undergarments never once appeared onscreen. Thankfully.

If you aren't finished with celebrity insanity yet, then check out 4 Great Artists Who Make it Really Hard Not To Hate Them. Or read about 7 Iconic Characters They Saved from The Cutting Room Floor.

If you're pressed for time and just looking for a quick fix, then check out The Most Baffling PSA Ever: Vote Like ... Spider-Man?