I had an emergency come up at work so I was at my computer which is by a window next to the front door. The doorbell rings and my wife answers. A kid, about three years old in a ghostbuster costume points at the window and says "why is he working?"
Wife: "That is a good question."
The kid then strolls into the house, turns into my office and says "What are you doing?"
Me: "That is a good question."

And that is it. No other trick or treaters all night.