An inflatable park company came to our town for a bit with a bunch of rides, one of which was a super high slide. I didn't understand why they were making us get into burlap sacks before going down, but I understood later - the speed near the bottom was high enough that I'm pretty sure I would've walked away with major burns if I'd touched the slide. My wife ended up with a mystery burn she noticed at the end of the day that I suspect came from this.