4. 'A Fish Called Wanda'

Otto and Ken (Kevin Kline and Michael Palin) in 'A Fish Called Wanda' (1988)

Poor, animal-loving Ken, who can't manage to kill a little old lady but keeps accidentally knocking off her tiny dogs. But he's a brainiac compared to his jewel-thief partner, the aggressive, arrogant Otto, whose ex-lover tells him, "To call you stupid would be an insult to stupid people! I've known sheep that could outwit you. I've worn dresses with higher IQs." It's deceptively hard to play this dumb; no wonder the role earned Kline an Oscar.