Keanu Reeves in ConstantineCONSTANTINE

At one point in Bryan Singer's original X-Men film, Wolverine stares at the fetishistic black-leather duds he and his teammates are wearing and asks, incredulously, "You actually go outside in these things?" To which Cyclops, in-joking on the character's original Marvel-comic attire, replies, "What, would you prefer yellow Spandex?" God, yes.

Edward Burns and Robert De Niro in 15 Minutes15 MINUTES

Near the start of writer/director John Herzfeld's 15 Minutes, two tourists-cum-thugs, the Czech Emil (Karel Rodin) and the Russian Oleg (Oleg Taktarov), murder a pair of acquaintances and torch their apartment, while the movie-loving Oleg videotapes the crime.