We've seen this game before but I just recently heard it again on the latest Leaky Pottercast so I'm bringing Harry's Pants game back.
Lines from HP that can be improved by substituting pants for a keyword.
Give it a try. Its really funny. 
"Accio
Pants!"
"You two just apparated on my
Pants."
"
Pants at the ready!"
"Now untie him Wormtail, and give him back his
pants."
Smith really was an idiot, thought Harry, hadn't he noticed them collide? But the next moment, his
pants seemed to drop out of the sky.
BTW,
Leaky is giving away free tickets to See Jo's NYC reading in August to the funniest Pants line at their site.