Whe I was 16, I did an orienteering thing on Cannock Chase that involved camping overnight ,
When we'd set the tent up, we were supposed to prepare a meal using on of the little gas heaters. As the (supposedly) senior member of the team

, I was responsible for chaniging the gas canister when it ran out.
Unfortunately, I didn't notice the spurt of gas when I changed it until, when I lit the heater, a streak of flame ran up my arm

- I stupidly just looked at it until being rugby tackled and having it put out. I wouldn't have minded, but they then marked the team down for 'dangerous use of equipment'