"A rabbi, a priest and a pastor walk into a bar, and the bartender says "what is this, some kind of a joke?"...
dead silence, she didn't get it... so a few sentences of explanation were necessary... and then I pulled out this one:
Give a man a duck and he'll eat for a day. Teach a man to duck, and he'll never run into a bar!
That got her, she actually laughed.

