Never understood people who are afraid of clowns. I find this phobia absolutely irrational.
Why the fear?
Most Helpful Girl
I think it's largely to do with painted faces being 'uncanny', which is talked about here: https://www.youtube.com/watch?v=PEikGKDVsCc
Things like painted on smiles and masks are unsettling because they distort our ability to judge what the person underneath might be thinking or feeling; their intentions.
Things out of context can also seem very creepy; for example, a clown at a circus on the night of a performance is much less scary than one standing in your back garden at night0
Most Helpful Guy
This kind of fear actually has a name: Coulrophobia.
See here for more background detailed information: https://en.wikipedia.org/wiki/Coulrophobia
This is what it said:
According to psychology professor Joseph Durwin at California State University, Northridge, young children are "very reactive to a familiar body type with an unfamiliar face". Researchers who have studied the phobia believe there is some correlation to the uncanny valley effect. Additionally, the fact that much clown behavior is "transgressive" (anti-social behavior) can create feelings of unease.