Here's one I got last night.

I was standing outside a bar smoking a ciggy, and a girl walked up to me...

girl: Can I ask you a question?
me: Sure
girl: Are you wearing anything under your kilt?
me: I can't tell you, its a national secret
girl: Can you do me a favor?
me: Maybe, depends on what it is
girl: my boss is standing by the window behind us, would you moon him?
me: (I'd had a few) Sure, what the heck. Hold my beer?

I was kind of hoping she'd return the favor, but better luck next time