Tremors
female: Are you challenging me?
male: Name your stakes.
female: If I win, you become my slave.
male: Your SLAVE?
female: You wish! You'll do shitwork, scan, crack copyrights...
male: And if I win?
female: Make it my first-born!
male: Make it our first-date!
female: I don't DO dates. But I don't lose either, so you're on!