Bad tricks grown-ups play on Halloween

So I took the kid on a trick-or-treat romp last night and came across what seems to be the latest fad in playing mean tricks on little kids.
  1. Put on lots of decorations in the yard and house
  2. Put on the outside lights
  3. Leave for the night.
  4. For extra credit have a sound track that makes it sound like you are walking up to the door after the doorbell is rung.
  5. For extra extra credit, do this to the house down the street with the family you knew were on vacation.
As it was.. I can see why some people find their houses covered in TP.