Okay, I can't take credit for finding this - thanks to Don Share for posting it first. From the 1958 teenybopper drama, High School Confidential! Recognize the guy playing the piano? Jackie Coogan (Uncle Fester). And the hep cat smoking at the table with the square chick is John Drew Barrymore - John Barrymore's son and Drew Barrymore's father.
(Oh, and the reason I can't be a beatnik? I don't own a pointy bra, Daddy-O.)