Experts don't agree on the cause and cures are equally open for debate.
Clowns visit hospitals with the aim of bringing cheer to sick children. The clowns have learned to wait outside the doorway in order to first judge if the clown is welcome.
Well-known celebrities have "no clown" clauses inserted into their concert contracts. Even Bart Simpson is famous for this line. "Can't sleep. Clown will eat me".
