The woman you'll see in this video has a unique way of having fun at the pool. She hops into a laundry basket, then scoots herself onto an active treadmill and lets the running surface send her into the pool. As you'll see, the speed of the treadmill gets progressively faster.
I'll be honest, this does look fun to me. My only issue is that if it gets too fast to where you lose your seat, that'll cause some serious road rash (ouch)! I'd try it, but I'd know my limits.