Coulrophobia alert !

Coulrophobia is an abnormal or exaggerated fear of clowns.

It is common among children, but is also sometimes found in
teenagers and adults as well.

Sufferers sometimes acquire a fear of clowns after having a
bad experience with one personally, or seeing a sinister
portrayal of one in the media.

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... and this certainly won't help matters:
http://nakedclowncalendar.com/bio.html