Crispin Glover the speed-popping wacko more wired than AT&T looked like he had a promising future in acting after Back To The Future and The River’s Edge. Then he tried to kick David Letterman in the head and his career went a little south.
Unbeknownst to Letterman and the audience, Glover appeared in character as “Rubin”, from a then-unreleased movie Rubin and Ed, wearing platform shoes and a wig. Rather than a conventional interview, Glover staged an Andy Kaufman-like shtick.
The subsequent confusion and controversy surrounding his appearance was compounded by the fact that Rubin and Ed was not actually released until 1991; however, the movie had been in development since before Back to the Future— Crispin had actually already devised Rubin’s “look” by 1985. Almost no-one, apparently including Letterman, understood what Glover was doing and the interview became the hallmark of the “weird” TV guest.