The Charlie's Angels Hat Trick
When you have sex with a blonde, a redhead (auburn or light brown counts), and a brunette (dark brown) within 24 hours separately. Sex parties and foursomes do NOT count. Bonus points if they know each other, but they don't know that you've slept with all three until after the fact.
Sorry man, I'm staying in tonight -- I'm beat from the Charlie's Angels Hat Trick yesterday.