Despite completely owning the role of Jordan Belfort in The Wolf of Wall Street, there were a few things Leonardo DiCaprio needed help with before perfecting the character.
Belfort himself has claimed that he had to teach Leo how to act on drugs, as he'd never taken them before.
In other roles the 42-year-old may have gotten away with not knowing the effects cocaine and Quaaludes has on your body, but considering Jonah Hill ended up in hospital from snorting too many fake drugs on the set, you'd say that it was essential.
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"Leo had never done drugs, so I showed him what it looks and feels like when you are high on Quaaludes," the real Wolf, Belfort, told The New York Post. "'I... started crawling around. We were both on the floor, drooling. His father walked into the room and asked us what the fuck we were doing."
The actor has claimed the same thing, saying that the whole thing is actually on tape somewhere, which is something we all need to see, to be honest.
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Leo referred to them as the "lost Jordan tapes". He added to the Daily Mail in 2014: "He crawled around the floor to re-enact the stages of getting high. He wasn't the greatest actor, but he certainly gave me the inspiration."
The teaching paid off, too, as one of the best scenes of the film - when DiCaprio crawls to his Lamborghini off his face on Quaaludes - was inspired by it.
In the film the actors snorted a blend of vitamin powder made to look like class A drugs.
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Appearing on US talk show Any Given Wednesday with Bill Simmons, Jonah Hill said: "I did so much fake cocaine in Wolf of Wall Street I got bronchitis for three weeks. I had to be hospitalised.
"It's vitamin powder but it doesn't matter because if you ingest that much matter into your lungs, you will get very sick.
"We were literally doing fake coke for, like, seven months, every day. I never had more vitamin D in my entire life; I could have lifted a car over my fucking head."
Given the success and cult status of the film, you could argue that it was actually worth it.
Featured Image Credit: Paramount PicturesTopics: Cocaine, Drugs, Leonardo DiCaprio, Leo DiCaprio