Two and a Half Men, Season 3

Charlie:
Hey, here's a fun fact. You're sleeping with a girl who was born when you were in junior high, and yet there's a good chance she lost her virginity before you did.

[Alan scoffs, shakes his head, and then starts to do the math in his head]

Charlie:
And here's another fun fact. I'll bet she's had sex with more girls than you too.

Alan:
[scoffs again, and again does the math and smiles] That is a fun fact!