There were probably some big fans of Harlan Ellison who nevertheless were unwilling to sit through a whole episode of Scooby-Doo to catch his 2010 appearance in the cartoon series.
Thank heavens for YouTube! Click here to see the 30-second clip of Harlan (as himself) conversing with “H.P. Hatecraft” in the episode titled “Shrieking Madness.”
[Thanks to Andrew Porter and Moshe Feder for the link.]