The G.O. screen from Street Fighter II, where you see have to see your opponent's comment (Zangeif to Guile: next time we meet I'm gonna break your arms), then you have the usual countdown and if you fail to insert a coin or press start your characters portait turns black & white and you hear him or her groan in agony, I swear when I first saw this when I lost as Ryu, I thought he died.
Another Street Fighter game that has an intresting Game Over screen is the arcade version of Street Fighter The Movie: The Game, it has the usual countdown and when it goes to zero you'll hear M.Bison (Raul Julia) yell "Game Over" from the 1994 movie, its pretty cool.