What people say to keep people from pinching them when they forget to wear green for St. Patrick's Day. It's perfect because the pincher can't disprove it without being a creeper, which is a more serious offense than not wearing green on St. Partick's Day. Also works with bras for girls.
Note: Doesn't work if the pincher is an actual creeper.
Sean: Hey you! You're not wearing any green!
Rebecca: Yes I am, I'm wearing green underwear.
Sean: Let me see!