one occasion a few years ago at my HS they would give everybody a wristband. First time caught grinding they would cut it, then if you were caught again you got kicked out. Stupid shit obviously and everyone kept dancing and once about 50% of kids were kicked out everybody left the dance and went out onto the greens infront of the school. Some seniors pulled their cars up to play music and everyone danced outside. Cops end up showing up for a noise compliant cause it was pretty late, and like 500-600 kids end up just running everywhere. Pretty hectic and funny / teachers were pissed the next day.