The appearance of actor Crispin Glover on
Late Night with David Letterman in 1987 is one of the most famous (or infamous) "interviews" in the history of TV talk shows. Glover, a strange guy to begin with, was clearly high (right?), and ultimately frightened Dave to the point that Letterman got up and walked away. When they came back from commercial, Glover was gone.
I remember watching this in real time. Mind-blown. But in those pre-Twitter, pre-blogging, pre-social media days, you had to wait until the next day to actually talk about it with other people.
Watching it again now, it's even weirder than I remember: