Hi, OP here. I guess I should explain this a little better. On the last day of school, we have a big awards assembly and then hand out yearbooks at the end. Our yearbooks always have a theme and the people in charge do a little skit at the end of the assembly. Our theme this year is fairy tales, thus the unicorn costume (our mascot isn't a rainbow unicorn lol). I'm editor in chief so I can't just back out, and the other people involved are really excited about the skit, so I'd hurt their feelings if I told them how stupid I think it is. I ended up trying to get out of it by telling them I couldn't make it to the rehearsal, but they just switched my part to the narrator. Not quite what I was hoping for, but at least I don't have to do anything embarrassing. You guys' comments made me laugh, and for all the people who said they would love to dress up as a unicorn, to each their own I guess!