Boojums originated in Lewis Carroll's The Hunting of the Snark. They are creatures easily mistaken for ordinary Snarks, but which are much more dangerous, having the capacity to make someone vanish from existence completely in an instant. Carroll's text is unclear on whether a Boojum is a variety of Snark, or a distinct but outwardly similar-looking creature.
Concepts from the works of Lewis Carroll in Jenny Everywhere media