If Jews observed Halloween:
Hilchot Halloween:
3) One who turns off the lights and pretends to be away is called a sinner!
4) Shaving cream used for tricks does not require kosher supervision.
6) To be considered a trick, one must damage property valued at at least one perutah (approx. 5 cents). A trick must also inconvenience the victim by at least 6.7 minutes. In case of emergency, there is a lenient position of 4.8 minutes one may be allowed to rely on. Consult your Halachik authority.
7) The pumpkin should be placed on the top step, to the right of the door.
9) One does not make a blessing before trick or treating, because it is not certain that the homeowner will be home.
10) When giving candy, one must give an amount at least the size of an olive (About five candy corns.) Some are of the opinion that it has to be at least the size of an egg. (twelve candy corns.) This opinion is preferable.
11) When egging cars, one should be careful not to drop any eggs prior to throwing them. Remember, bal Tashchis!
(Authorship unknown)