Dinosaurs

I'm sure a common joke back in the Jurassic era would be when one dinosaur would cover a tar pit with a bunch of leaves. Another dinosaur would probably try and walk right over it, but he would fall through the leaves and get trapped in the molten tar. They would both have a nice laugh about it, or at least until the dinosaur sank all the way into the tar. Then it would be just the one dinosaur laughing.