"You drill a hole into a tree stump, or something, big enough to admit the raccoon’s hand. But you drive some nails in around the edge of the hole and bend their heads inward so that he has to thread his little paw between them to get it into the hole. Then you leave a piece of bait in the hole. The raccoon insinuates his hand into this thing and grabs the bait. But he can’t pull his hand out between the nails unless he lets go of it. He ends up trapped by his refusal to let go, you see."