Jay Leno

On the human face, the mentum refers to the protruding part of the chin. Jay Leno’s distinctively large chin has been something of a trademark for the comedian. He suffers from what is known as mandibular prognathism. His 1996 autobiography "Leading with My Chin" is an obvious reference to the anatomical feature that a television executive once told him "could be frightening to children." In his book, Leno says he is aware of surgery that could reset his chin, but does not wish to endure a prolonged healing period with his jaws wired shut.