Too much to list liao but the ones I seen backfire were
Raising chair above head then the chair leg smash into the
fan
Student sent home for haircut then told to report back in an
hour but instead of coming back went to play traunt
Asking a student get out and stand in the middle of basketball
under the hot sun when teacher came out to check on him he tio
taiji with other people from another school.
Student being singled out for skin head haircut even thou he
claimed he wasnt trying to be a skin head. Next day half the class
also cut skin head to show support