Who Is A Clown?

Everyone knows a clown when the see one.

A clown is a clown is a clown.

Everyone knows who a clown is without defining that.

Clowns:
Richard Heene-Balloon Boy
Gene Simmons
Richard Simmons-Looks like one. Is one.
Dubya-Love him but he is a clown.

Some others discussed on the show ensue...