This seems highly context dependent. In the SF schools I've been in, you'd get your ass handed to you by 8-15 other people if you did this to the wrong person.

This seems highly context dependent. In the SF schools I've been in, you'd get your ass handed to you by 8-15 other people if you did this to the wrong person. Also, if you hit someone with a chair you're going to get expelled, even in the public schools.