oh, banana.
Also, in Terror Island, there was a joke similar to the "double correction," e.g., "what's that movie where Humprhy Bogart is trying to get people out of Morocco," "oh, you're not thinking of Humphry Bogart, you're thinking of Robert DeNiro, and it's not trying to get out of Morocco, it's trying to overthrow the government in Terry Gilliam's Brazil."
The joke was in this strip:
http://terrorisland.net/strips/048.html and is quoted as follows:
"First Folio: Do you think hypnosis would work on descendants of Norse gods? / York: Are they the ones whose vision is based on emotion? / First Folio: No, you're thinking of lizards. And it isn't emotion, it's light."