Edward Norton in Birdman (2014)

Edward Norton stripped down for his role in the Academy Award-winning comedic drama, Birdman: Or (The Unexpected Virtue of Ignorance). The film follows Riggan (played by Michael Keaton), a washed-up actor who attempts to rebuild his life in the days leading up to the opening of his Broadway play. Edward plays Mike, his acting rival and in one of the film's early scenes, Mike is seen trying on costumes, allowing Edward to get naked in front of a mirror for several minutes with his butt on display. A later scene finds Riggan confronting Mike while he's in a tanning bed, treating viewers to several shots of Edward in a speedo, even as the two men get into a physical fight.