If you’re planning to dress up for Halloween on a college campus this year, you need to take extra special care to make sure you won’t offend anyone. Otherwise you might find yourself in front of a firing sq — er, maybe just getting ratted out to campus administrators.

The University of Massachusetts-Amherst is trying to pre-empt hurt feelings and cries of “cultural appropriation” by plastering dorms with messages informing students about the dangers of Halloween costumes.