When I lived in Florida I lived at one place where the kids would have shopping cart races. They were hilarious! I didn't even get mad (for the most part) when they would disturb my afternoon nap with them.
They would take 2 shopping carts and fill them with various amounts and sizes of children. Usually the bigger kids would push the carts. They would race them and the best part was when they would hit the speed bump! Kids would go flying in all directions!
Then they would get back up and do it all over again!
Oh, to be as indestructable as a child again.