What crazy things do you let your kids do every now and again thats just crazy and fun?

Paris likes to get a teaspoon, crank her favourite CD and stand on the coffee table and dance and sing. Now I don't let her on there *all* the time but she's allowed to do it occasionally

So what craziness goes on at your house? How do you let your kids have some crazy fun? Do you have water fights? Food fights? Midnight Parties? Dance on the tables?