One of the more common specific phobias, musophobia involves an extreme fear of mice and rats.

This fear's name comes from the Latin word "spectrum," which means "apparition."

Necrophobia comes from the Greek word for corpse, "nekros." It is the fear of dead things and things associated with death.

The number of the beast, or 666, is linked to the Antichrist in the Book of Revelation. People with this phobia are averse to the number in everyday settings, and change the number when they can (even if it means adding a cent to their receipt so the total becomes $6.67).

From Pennywise to John Wayne Gacy, clowns inspire fear in many people. You've heard the exclamation, "Clowns freak me out," but now you know the word for it.

"Stygios" is the Greek word for hell. In Greek mythology, the Styx river represents the realm between the Earth and the Underworld.

Panphobia derives its name from the Greek word for "all," but it's also called omniphobia, pantophobia and panophobia. It is the fear of everything, or the constant fear of an unknown cause.

Thanatophobia is the fear of one's own death. The name is derived from the Greek personification of death, Thanatos.

Yep, it's a thing. Omphalophobia is the fear of belly buttons — the discomfort usually comes from a person's belly button being touched.

This term is an abbreviation of "no-mobile-phone-phobia." A U.K. research organization found that more than half of all mobile phone users surveyed felt anxious without a working phone.

Papaphobia is the fear of the pope, the papacy or even the Roman Catholic Church — though a bad pizza can be pretty scary!

The fear of dolls is considered a more specific form of automatonophobia, the fear of human-like things.

Pogonophobia is the fear of beards. While it is in fact listed the Diagnostic and Statistical Manual of Mental Disorders, it is also used in reference to workplace discrimination towards people with beards.

Mottephobia is the fear of butterflies and/or moths. Maybe it's the fluttering right by your face, or the funky tongues that extend out so far, but some people do suffer from this.

What, just because they have sharp teeth, paper-thin flapping wings and pointy little fingers? So what if some species suck blood? Poor, misunderstood bats!

As "Doctor Who" fans may know, this fake phobia comes from the name of a novel written by Jonathan Morris that features the Eighth Doctor.