Halloween (or Hallowe'en) is an annual holiday observed on October 31. It has roots in the Celtic festival of Samhain and the Christian holiday All Saints' Day, but is today largely a secular celebration.

Common Halloween activities include trick-or-treating, wearing costumes and attending costume parties, carving jack-o'-lanterns, ghost tours, bonfires, apple bobbing, visiting haunted attractions, committing pranks, telling ghost stories or other frightening tales, and watching horror films.

According to traditional belief, a ghost is the soul or spirit of a deceased person or animal, taken to be capable of appearing in visible form or otherwise manifesting itself to the living.

The deliberate attempt to contact the spirit of a deceased person is known as necromancy, or in spiritism as a séance.

Selkies (also known as silkies or selchies) are mythological creatures that are found in Faroese, Icelandic, Irish, and Scottish folklore.

Selkies are seals that can shed their skin to become humans.

Selkies are able to become human by taking off their seal skins, and can return to seal form by putting it back on.

A werewolf, also known as a lycanthrope (from the Greek λυκάνθρωπος: λύκος, lukos, "wolf", and άνθρωπος, anthrōpos, man), is a mythological or folkloric human with the ability to shapeshift into an anthropomorphic wolf-like creature, either purposely, by being bitten by another werewolf, or after being placed under a curse.

This transformation is often associated with the appearance of the full moon

Werewolves are often attributed superhuman strength and senses, far beyond those of both wolves and men.

Vampires are mythological or folkloric beings who subsist by feeding on the life essence (generally in the form of blood) of living creatures, regardless of whether they are undead or a living person.

"belief in vampires and bloodsucking demons is as old as man himself"