People like clowns, they are funny!
A clown figure is the image of a very clumsy person, sometimes even stupid. They wear oversized clothes, huge shoes and have ridiculous makeup.
They do things way too stupid for normal people to even consider, their jobs is to be whereever there is a need to from someone to laugh about.
Clumsiness of clowns is so funny, because it is intended, naturally clumsy people are not, because their clumsiness happens accidentally and often creates awkward situations rather than funny ones.