Tell me your party trick - Name one thing you can do that is entertaining or out of the ordinary, like inhaling a dog tag chain through your nose and pulling it out through your mouth, or opening beer bottles with a fish knife.
I'll go first. I sing surprisingly good acapella renditions of old Irish drinking songs. Plus, I can touch your nose with my tongue. Which may not seem like much of a feat unless you're 3 sheets to the wind and didn't quite process what I said until after you've made the bet.