Mermaid Apple Bob
Throw a giant bob for apples challenge in a pool.
Tie everyone's arms to their sides and dress them up like mermaids, tails, bikinis and all. Give them a giant scuba flipper.
The balls are bull balls, fish guts or dead snakes.
After a few runs, unleash a bunch of eels, octopus, etc.
Cover the pool with the automatic pool cover.