Dad was the principal at one of the Jr. High schools in town (not mine, thank God). He used to go in at night to work in the school's woodworking shop. We kids would go along and play in the gym. The school building was OLD and in fact was torn down several years ago. It had a banked track above the gym.
One time the trampoline was left out from gym class, so I pulled it over and positioned it so that I could jump from the track railing onto the trampoline.
I landed on the trampoline just fine, on my a$$, but the trampoline "gave" enough that my a$$ still hit the gym floor.
Can't remember how high I bounced, but I can remember how much that hurt....