SPOILER ALERT

Rory: Why would people celebrate victory by shagging?
Jon: Whaaa?
Rory: At the end of the movie, Mel Gibson's daughter heralds the departure of the invading aliens by pointing out that "they're doing this [simulates sex] on TV."
Jon: Dude, she was dancing!
Rory: No… She repeatedly thrust her arms back and her pelvis forward. What do you call that?
Jon: The white person's touchdown dance!
Rory: Pshhh…