Crispin Glover once made a memorable appearance as a guest on "The Late Show with David Letterman". Having emerged wearing a wig and platform shoes, Glover proceeded to deliver a swift kick in the direction of his host's head. Producers cut to a commercial and Letterman momentarily left the set. And Glover? He simply disappeared.
(Though Glover was invited back, and returned, on many occasions, the incident remained a mystery.)
[At the age of five, Glover buried his massive collection of Hot Wheels and Matchbox toy cars. "It's one of the few things I've done in my life," he once remarked, "that I am genuinely perplexed about."]