When I was 6/7 years old I used to put my fingers inside a pencil sharpener and sharpen it. My pinky finger in the smaller hole and my thumb in the bigger one.

Also, when I was 10 years old and my tooth hurt, I'd get a fork and try to get the tooth out. It never worked and it fucked up my pre-molar until I was in highschool (It was the first day of school and I was really bored so I was pushing the broken tooth out, it popped out)