Fill 2 kiddie plastic pools full of ice. Put 50 marbles at the bottom. Give the kids a certain amount of time (I think we used about 3 minutes) to dig the marbles out of the pools with only their toes. It is very cold and exciting to watch. Then play a second round and the kids will only use their mouths. They think it is fun but do not remind them of all the toe jam floating around in the ice and on the marbles.