The episode: “The Killer Shrews,” ep. 407
The riff: Asked out of nowhere by Joel after a woman tells a man “You seem so disinterested in everything. Aren’t you the least bit curious?”
The explanation: This is actually a rather clever reference to a 1967 Swedish drama film called “I Am Curious (Yellow),” which then had a sequel called “I Am Curious (Blue).” In the United States, the film obtained a degree of infamy after its realistic scenes of sex caused it to be banned as pornographic in Massachusetts. However, after going through appeals all the way to the U.S. Supreme Court, it was found not to be obscene.
Novelty factor: Never heard of this film at all. This is the kind of crazy reference they would make on MST3k with a single word.
WARNING: This clip may contain boobs.