Basically you take a line out of any movie, and subsititute a noun in the line with the word pants. Here's an example........

 

"And then your father did something Snape could never forgive."
"What?"
"He saved his pants."
"What?"
"Yes ..." said Dumbledore dreamily, "Funny, the way people's minds work, isn't it?"

 

It's from HP  Should be very funny  As long as we keep it clean *ahem* yep we all know what clean means.

And don't forget to include the original version and where it came from unless it's dead popular.

 

 

"You had me at pants."

 

 

Jerry McGuire - "You had me at hello."