Dumbest thing you've done recently...

Yeah, I had a really humbling moment yesterday, and decided to start a thread about dumb things people have done. Here's mine.
I was out doing target practise with my paintball gun, when my little brother (10 yrs) walked up. The trigger on his gun wouldn't move, and he wanted help. So I fiddled with it a while, made sure the safety was off, etc. Finally, pointing it down I decided to see if the CO2 canister still had air or not. So I put my hand ovr the muzzle of the gun and tried again to pull the trigger. Well, it worked, I now have an absolutly huge swollen bruise on my left hand. It's quite painful. Luckly, I'm right handed.