What is the difference between a baby and a trampoline?
You take your shoes off to jump on one.
Listen up, buttercup. This "joke" is trying to be funny by comparing a baby to a trampoline. You jump on a trampoline, but you wouldn't jump on a baby... unless you're not too bright, which, judging by your taste in humor, might be the case. Trampolines are for bouncing, you see, something you probably do when your brain short-circuits from overthinking.