Halloween is an event celebrated on October 31st every year.
One year, the fish of the fish tanks in Bud's Pets, tired of Jocktopus Vandenbush stealing their candy, trick-or-treated outside the tanks. The plan failed, however, when Randy Pincherson, one of the trick-or-treaters, was discovered to have lead Jocktopus to them the whole time. ("Halloween Haul")
- Halloween at Wikipedia