Image from here. From the Wikipud:

Larry Harmon [Lawrence Weiss 1925-2008] was born in Toledo, Ohio and raised in Cleveland. During World War II, he served as a private in the Army. Upon returning, he harbored dreams of becoming a doctor, until he met legendary entertainer Al Jolson. According to Harmon’s autobiography, The Man Behind the Nose, Jolson told him, “Being a doctor of medicine is honorable, but you’ll touch so many more lives as a doctor of laughter!” Harmon instead attended the University of Southern California, where he majored in theater and performed in the Spirit of Troy marching band.

That’s Bozo above, 4th from the left, jammin’ with some of his USC fraternity brothers, decades before he appeared on an Overnight Open Thread.