system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why/how does "wetting" a trampoline with water cause it to bounce you higher?
gpt
It works something like this: when you wet a trampoline, some of the water gets trapped in the mesh of the trampoline which weighs it down a little.  So before you even jump on it, the trampoline is "pre-tensed".  So when you jump on it, you're able to stretch it further than you would normally would be able to.  However, the key is that when the trampoline snaps back, it's moving so fast that the water that was in the trampoline cannot hold on to it and gets left behind, removing itself from the trampoline.  The end result is you are getting a stronger snap back than you would be able to achieve by yourself.