When I was a summer camp counselor, on the first day I would always tell the joke/riddle

    Two canadians are paddling a canoe across a vast hot walmart parking lot.
    One of them turns to the other and says 
        "Where's the paddles, Eh?" 
    His buddy replies 
        "Eh, sure does."

It's a real slow burner, but invariably after an hour or a day one of the kids would get it and share the answer around and they'd all laugh. Then I would tell

    Two seals are sitting in a bathtub full of warm crisco. 
    One of them turns to the other and says 
        "Hey, could you pass the soap?"
    and the other answers
        "What do I look like, a typewriter?"

And, primed to believe that if you think hard enough, QuadmasterXLII jokes really do make sense / have a punchline, they'd entertain themselves the rest of the week hunting for an explanation that doesn't exist.