When I was a kid the local mall did a contest called a ‘Jello Jump’. They had 500 gallons of jello with different colored marbles in it. You would jump into the jello and root around for 1 minute to try and find a marble. The marbles were to claim prizes based on their color. Just to make that much jello they bought out the stock of 3 small grocery stores. We came out looking like a toxic creature, but it was a great way to cool off and have fun.