What was the stupidest thing you did as a kid?

My cousin bound magasines to his shoes and slid around on his carpet at home when he was around three years old. This was all fun and games until he fell down and broke his fucking femur in a spiral fracture. At the hospital, they set it without anesthetic for god knows why; the medical professionals responsible were berated for the decision afterwards. Apparently, the poor child screamed when they drove past that hospital for [i]years[/i] afterwards.

He wore a gigantic cast that extended the whole way down his leg and up part of his torso. I was a baby at the time, and didn't really notice.