A game usually played in swimming pools, one person is it and they try to tag other people, they can only say "Marco" or "fish out of water" (when the other people are out of the pool, if they get caught they are it), and when they say "marco" the other people that are not it have to say 'polo'. Really fun.
I was playing MarcoPolo in someone's weird pool and i accidentally rammed my hand into one of those step things on the sides.