Not overheard, but:

T-shirts seen at Wegman's: "Stop looking at my t-shirt"
and my own personal favorite: "Suzy Q Bail Bonds cuz your mama wants you home"

At Loaves and Fishes

Overheard in the line waiting for food to be served: "Have you looked at the wine list? I think a chardonney would go nicely with this."

Overheard at the Ithaca Festival

Wrestling through the crowds: “It’s not good for your agoraphobia.”
-KAZ

In the checkout line at Wegman's

Checkout woman: "I love the smell of local strawberries. I wish my father was still here. He used to take me strawberry picking near Spencer and if there were wild blackberries by the side of the road we'd stop and pick them too."

Crucial question

Mother to girl playing Gameboy: "What's the point of a virtual world if you can't change your clothes?"

On the way to the swimming hole at Six Mile

Blonde young woman to apparently gay young man: "Noooooo, I didn't even sleep with him and he was in love with me."

Heard on campus

Guy: "What happens in Potsdam stays in Potsdam."
Other guy: "What happened in Potsdam?"
Guy: "I don't know."

We know the feeling

At the library: "I don't act responsible, because I hate acting responsible."