In Steve Spangler's book Naked Eggs and Flying Potatoes there are pictures from a television appearance during which Spangler created a HUGE batch of cornstarch and water and then walked in it. J was fascinated by the idea and I promised him we would give it a try when the weather was nice enough.
Since we had a week of beautiful weather we pulled out a plastic bin and six boxes of cornstarch. I really should buy stock in cornstarch these days.
Once our mixture was ready the boys jumped right in. So much fun!