You pick a movie title and put "in my pants" after it.
ex: Curious George in my pants
Sweeney Todd in my pants
Green fried Tomatoes in my pants( from my friend)(not me)
Hairspray in my pants
In reference to Crunchpatty's song post (several pages ago):
"Tiny Dancer in my pants"
^^this once officially belongs in the movie thread (2006, directed by Ford Austin)
National Treasure:Book of secrets in my pants.
Up in my pants.
New Moon in my pants
Love Actually in my pants
Lock Stock and TWO Smoking Barrels in my pants
and if that last one wasn't crass enough for you
For a Few Dollars More in my pants