Crocodile Dentist is also called Crocodile Roulette.
You can't decide who treats guests, who walks the dog, who cleans the house, who does the dishes... don't worry, let the crocodile decide for you. It's also a party game or a birthday party game. For example: you can decide who has to be punished to clean the room at the party. You put your hand on the crocodile tooth, nothing happens, you are lucky. If you get bitten by a crocodile's teeth, you should be punished for cleaning the room.