Original source : http://www.cracked.com
Posted : August 2006
Author : Ryan Grim
5. Crispin Glover on Letterman

Date: July 28, 1987
Evidence: The first symptom is the wig. We're not sure what George McFly's hair
looked like prior to this interview, but we're pretty certain it didn't look
like that. Then there's the clothing. He's dressed in striped pants, a heinous
purple shirt and a pair of black platform shoes that don't appear to fit him. Keep
in mind that this is '87, not the early '70s. If you're wearing what Crispin
Glover is wearing during this interview, then you've clearly been high long
enough to have gone shoe shopping while f**ked up.
As far as behavioral symptoms, we're not really sure how to describe what
Glover is doing here. At first he seems to be terrified of Dave and the
audience, but then he challenges Letterman to an arm wrestling match and tries
to jump-kick him in the head.
Drug(s) They Were Probably On: Difficult to tell. At first it seems like a
classic acid freak-out. He is looking at Dave like he has three heads and the
audience like they're a big tangled lizard orgy. But then he starts getting
physically aggressive. Our theory: a second drug along the lines of PCP, taken
right before he went out, kicked in halfway through the interview.