When driving around Greece in a bus two years ago with school whenever I stood up I hit my head on the bagage rack above me. Would have thought I'd learn after the first few times, but no.

Chap in my year skates a lot, but had grown somewhat during the holidays which changes the necessary technique. Not once, but twice when taking a bend he stabbed himself in the back of the foot with his other skate, the second time rather deeply; can't skate for a while now.