I remember trick or treaters coming to my grandmother's door once when I was a kid. Nobody knew what to do so my grandmother gave them a packet of Arnott's Nice biscuits and sent them on their way. I'm sure it was the score of the night for them. That's about the extent of my direct experience.
Despite my apathy about Halloween, Tim brought home three pumpkins and had lots of fun turning one into Mr Evil Pumpkinhead. He's actually pretty cool looks great all lit up.
Happy Halloween and have a great night!