I don't consider anything with a budget the size of National Treasure to be a "sleeper." That could be just me, though.

How 'bout Charade, with Cary Grant and Audrey Hepburn? It's the only movie they ever did together.

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Gillian

"Now everyone was giving her that kind of look UFOlogists get when they suddenly say, 'Hey, if you shade your eyes you can see it is just a flock of geese after all.'"

"You can't erase icing."

"I can't believe it doesn't work! I found it on the internet, man!"