another joke along this theme...
You ask someone these questions - the answers should all come easily to them except the last (the punchline).
Q: What bird represents America?
A: The eagle?
Q: Right. What bird represents peace?
A: The dove?
Q: What bird represents Thanksgiving?
A: The turkey?
Q: Right. What bird represents wisdom?
A: The Owl?
Q: Right again. What bird represents true love?
A: -------------- (here's where you get some confused answers. Let'em guess a couple wrong answers, then tell them.)
Q: THE SWALLOW!
...just think about it, you'll get it...