Because bad ideas come in all shapes and danger sizes, this is a video of Australian Youtuber I Did A Thing building and testing a propane pulsejet-powered swing set. The sound it makes as it goes around is nuts. Unfortunately (but probably actually fortunately for them), the swing is only ridden by a test dummy and they never actually strap themselves to it. That seems like a missed opportunity to me. A missed opportunity to finally go over the bar and unlock infinite bragging rights on the playground! Plus turn yourself inside-out.