Jay Leno, Mark Harmon Once Made Cameos on 'Laverne & Shirley'

Jay Leno, Mark Harmon Once Made Cameos on 'Laverne & Shirley'

During Thursday’s “The Tonight Show” on NBC, host Jay Leno and CBS’s NCIS star Mark Harmon both had their cameos on the late 70s-early 80s sitcom “Laverne & Shirley” showcased…


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