Perhaps it's about getting in touch with your darker side. Clowns, circuses and carnivals are often seen as innocent and all-American, but they have their darker sides (Clowns in particular - John Wayne Gacy, anyone?) The lines about 'the clown in yourself' could be about how everyone looks down on those who get in touch with their darker side (scatologists?), and yet everyone has one.
Perhaps it's about getting in touch with your darker side. Clowns, circuses and carnivals are often seen as innocent and all-American, but they have their darker sides (Clowns in particular - John Wayne Gacy, anyone?) The lines about 'the clown in yourself' could be about how everyone looks down on those who get in touch with their darker side (scatologists?), and yet everyone has one.