Last year I obtained a pair of individual vampire teeth that fit over your upper canines. I wore them to work on the checkouts for the evening and acted as though they were not there. When children pointed at me I just smiled at them and pretended there was nothing unusual.
The previous year I spent the whole evening with a plastic rat on my shoulder. When a customer asked me if we had any steak in stock I told her no, but I can go out back and kill you a rat if you like!
I'm not working this Halloween but if I was I would be wearing spiders in my hair.