Haloween Costume.

One year I wore my dad's old mission suit, carried a breifcase and told people I was an IRS agent and that their Candy Tax was due.

Another year I cut a head-hole in a cardboard box and made a Tank costume with a gun made out of cardboard tubes. I had a little window cut in the front of the tank for people to insert candy into, with a bag there that would catch it, but people kept putting the candy down the gun tube instead which was frustrating.