My niece Little Iz loved the lightsaber that went along with my costume. She hasn't seen the Star Wars movies yet, but what's not to like about glowing laser sword?
After trick-or-treat time was over for her, I let her have fun with the laser sword for a few minutes while we waited for the last waves of trick-or-treaters. She tried to do landscaping with it. Would probably do well at that job if it was real.