Childhood Rules Broken

Some friends were spending a last night at their childhood home before it would be sold. They'd gone to a store that sold pool supplies at their father's request to pick up some chemicals. There, they saw an advertisement for the pool cover their parents owned. All their lives, there were forbidden to walk out onto this pool cover, even though it looked like a huge trampoline; their parents said they'd fall through and break it. The advertisement for their pool cover at the store showed an elephant walking on top of it. I'm not sure if they bought the chemicals or not, but I do know that the neighbors called the police on them later that night for making so much noise while jumping on the pool cover.