Pranking

This last week my apartment was pranked, some girls came in and put marshmallows all over the place. The question i want to know is when is pranking gone too far, is it when someone gets offended or is it never okay or is i too far when some of the property in the apartment gets vandalized. This is what happened in this case, in their good fun of littering our walls with the marshmallows the culprits stuck some of the marshmallows on a few 0f the posters that we have hanging in our kitchen. As a result of this those posters are now ruined because when we took the marshmallows off the posters tore where they were and the ink that was there is now gone. I ask again when has pranking gone too far, for me this was too far, my personal property was damaged and now we have more to clean for the cleaning check on Monday.