Robin Williams has often made jokes about circumcsion in his stand up comedy. In one, he was wearing tight leather pants, pressed hands to make outline of dick visible, and then shouts "Oh look, he's catholic". (many girls would say "you can tell a guy's religion" when some guy was wearing pants with visible VPL).
Always wondered if he grew up cut or uncut.
In one letterman interview (back when it was the late night with david letterman), he was wearing a circular hat when he walked in, and after he sat down, he removed it while saying "I'm removing this hat now, makes me feel like I am about to be circumcised" (laughter while letterman is grumbling) and then he says something akin to "don't worry its all done now".