Denzel Washingtons impeccable Method acting nearly led to a fight between himself and Josh Brolin on the set of American Gangster. Washington is well-known for using The Method, which was developed by Stanislavski, but Brolin was unaware his co-star was in character while they ran lines on set. Brolin prefaced his story by explaining, Denzel and I, by the way, get along very well now, and then the actor said (per In Depth With Graham Bensinger):

Yeah, we almost got into a fight [] Denzel was a little late to set, and there was a whole thing there [] I was trying to remember the structure, and then we rehearsed. It wasnt that many lines, mostly mine. And Im supposed to be Super confident. Its Denzel Washington, man. Its, like, not easy. Youre just some actor who theyre trying out, seeing if hes the real thing or not, and I forgot a line.