Randomly and uncontrollably shouting out a quote from Chappelle's Show that has nothing to do with your current conversation. This happens quite often while talking to hardcore Chappelle's Show fans.
Dude 1: "Hey man, how did your date go with that girl last night?"
Dude 2: "We went to dinner then back to my place...'I didn't do dat Rhonda!'"
Dude 1: "What the hell was that?"
Dude 2: "Sorry man I think I got Chappelle Tourettes."