With all the anger at people wearing blackface for Halloween, you'd think that's the only offensive costume out there. Fact of the matter is, so many costumes we take for granted as "traditional" or "innocent" or "the only thing the Halloween store had left" are insensitive to many social issues and marginalized groups. To help prevent you from crossing the line of good taste, here are some commonly worn costumes you probably didn't even realize were offensive.