1) Sit on the roof and jump down, covered in fake blood and chase them off. My friends and I did this at different houses around my neighborhood and scared the living crap out of the little trick-or-treaters.
2) Hide in the trees, wearing all black and a Scream mask and stalk different ones. When they're not near any houses go behind them, scream and pick one up. Then drop IT, yes it meaning the kid, a couple seconds later. My friend Thomas did this to my little sister and she still won't go out of the house alone.
3) Hide inside a barrel of hay, dressed as a scarecrow, with your hand through a hole in the candy bowl and whenever someone comes by, grab their hand and shoot out of the hay, screaming that you have them now after hundreds of years. My bro did this to some fifteen year old who was with her sister and the girl peed herself. Priceless.
4) When you answer the door, look at the trick-or-treaters, act shocked and scared, and start screaming your head off. Slam the door and run around the house, screaming until they go away. I did this last year to a group of teenagers who go to my school.
5) Sneak around the back when they knock with a blowhorn, and one of those cheer things and blow the blowhorn into it, scream into the youngest one's ear and run off.
