But the whole 'hurt people hurt people' thing is very true, and giving them repeated free hits only does more damage to everyone in the long run.
Madness string 111935
We used to get powdered laundry detergent and add just enough water to make it sort of a paste where it would match the popcorn ceiling. Then you can proceed to paint and draw all over the ceiling, and it was invisible. Until someone brought a blacklight into the room. Shenanigans were then revealed.