I cannot remember the name of the episode but it is the one where Bart goes to a novelty shop and superglues a few novelty items to his face. Only terror sweat would make it come off. Also I think that is a button device?
Since other people already got the joke I’ll grab the point for the ‘A’ plot: this one is the one where Lisa wants to go to the Isis exhibit. Marge has to take Bart to the hospital so Lisa wants to take a bus by herself.
I'm sorry that's incorrect, Lisa in fact wants to take a limousine to the museum, but Homer, being the tough father he is, convinces her to take the bus.