We call it skipping rocks in English, you've got it right. The worst I can think of right now is when I was about 7, I was really mad at my older brother (I can't remember why), so I went and played around with the tuning and strings on his bass. Turns out I really messed them up, and he had to get new strings. I can say though, that whenever I do things like that I feel bad about it for..10 years, as I still feel bad about that now.