I think that Letterman appearance was an act. From what I understand, he appeared on the show a couple of weeks later. I don't think Letterman would have brought him back (the angry douchebag, if truly offended by Glover, would have banned him). Moreover, I don't think he was under the influence of anything ... that kick would have landed him on his ass :-).

I could be totally wrong of course :-) . It isn't like I know the guy ... I just got the biggest kick out of his "persona" ... he's like Andy Kauffman on acid :-).

I do know most of Glover's problems in Hollywood started right around the time Back to the Future 2 and 3 were being produced. It is criminal what they did to him ... again, he only wanted to be paid fairly.