A completely understandable childlike fear of mimes in general, and the mime group Mummenschanz in particular. This can be brought on by, for example, their (admittedly entertaining to many people) freaky appearance on The Muppet Show.
"The start of the Mummenschanzphobia when the Mummenschanz episode comes to TV. The clay mask act frightens me like crazy and I ask my parents to erase the episode."
-- Jog Jalink