I left a lego man on the box stove when my sister & I were called in for dinner. When we came back he was a blob of multi-coloured melted plastic. My Mum lined us both up to extract a confession and to my total surprise my sister coughed for the job. Mum made her buy me a new lego man. I confessed later & paid her back!
Strolling through the garden as a boy, catapult at the ready for rats etc, when a chicken popped up its head.
Reflexes got the better of me, what is to be will be, etc... and I shot the chicken.
It copped it in the throat, gurgled about and flopped to the floor. I ran to tell my parents of my error. On our return to the scene of the crime we found that the bird had completely recovered and walked off. We counted the chickens - all present & correct. I think that taught me to keep quiet for a bit in case the worst does not come to the worst.
Adult misdemeanours - in 1996 I accidentally tripped the turbo in my boss' 3 litre Toyota Supra going over Prince Street bridge (cobbles) in Bristol, spun the car and snapped a cast iron bollard off at ground level with the back of the car. If you look carefully you will see that one has a big scratch on it and has fresher cement around it. He was not impressed.
