What's the stupidest thing you've ever done?

Ok a real list of stupid things that spring to mind:

1. Fired an air-rifle through my sister's bedroom door, while she was in the room
   
2. Accidentally set fire to my windowsill with a chemistry set
   
3. Used to tamper with the hinge on my sister's folding bike, so it'd start folding up on her as she went downhill
   
4. When about 12 discovered super-glue and me and some friends then went about sticking different parts of our bodies to themselves (you can stick your top lip to the tip of your nose, and ears fold over...)
   
5. Gave my cat some moon-dust wrapped in bacon, he nearly hit the kitchen ceiling
   
6. Decided to repray some bicycle parts but used the bonnet of my dad's car as a work-bench
   
   
   
   

I'm getting bored now that covers up to about 12/13.