I broke a teacher’s windscreen at school when I was about 9 or 10. Didn’t intend to, just carelessly through a stone up in the air in the playground. Teachers used to park on the edge of it. It was his fault really, right?
While walking the family dog, in my late teens, I kicked a stone which shot across the road at a pace much harder than I’d intended. It hit the opposite kerb and ricocheted up and hit the lounge window of a house. I tried to look nonchalant as my dog did a wee and it must have worked as the family came out and looked up and down the street but didn’t challenge me. The window didn’t shatter but it must have been damaged. I didn’t go close to inspect my work.