On Halloween, kids dress up in costumes like witches, vampires, and pirates. They go trick-or-treating, carrying a pillowcase to collect candy from houses decorated with jack-o'-lanterns and cobwebs. Popular monsters seen on Halloween include vampires that drink blood, mummies wrapped in bandages, and werewolves that transform during a full moon. Witches may cast spells, fly on brooms, and brew potions in cauldrons while wearing pointy hats and keeping black cats as pets. Haunted houses are places said to have ghosts that go "boo" and are decorated with cobwebs and bats.