"Back in my day"
(My family uses that so much when they talk to me, my sister and my cousins so much it drives me crazy)
A few classics:
Legally drunk ("If its legal, what's the problem")
Takes the cake ("Where?")
Down the tubes ("What tubes?")
Fine and Dandy ("This sounds like a dangerous mental condition")

"What happens in Vegas, stays in Vegas!"
Yeah right! If we're in Vegas, and you do something stupid, I'm telling everyone!
