Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

Example input: At the beginning of the movie Gangs of New York, Priest Vallon tells his son not to wipe the blood of the blade after he's cut himself shaving, saying "The blood stays on the blade". I've watched the movie multiple times, but can never find what the meaning behind that phrase is. Anyone able to shed some light on this?
Example output: What's the meaning behind the phrase "The blood stays on the blade"?
Example explanation: A person gives a detailed description about a scene from the movie Gangs of New York and asks the meaning of a said phase in the scene. The question is summarized as What's the meaning behind the phrase "The blood stays on the blade"? for easy indexing the next time someone searches for a similar phrase
Q: In an episode of Bob's Burgers (Sheesh! Cab, Bob), Bob is driving a cab to get some extra money, and in one scene he turns on the radio and makes a comment like "FM! Nice!" Then in another episode (Bad Tina), Tina has some of her friends in her room when Zeke exclaims "I wanna hear some FM baby!" My question is in regards to the mention of "FM" .. Is that some kind of inside joke to the show or the area the show is supposed to take place in, or is it an anachronism of some kind? I know it's referring to FM radio, but I don't quite understand if there's supposed to be a joke in there outside of the fact that it's simply "FM radio" and thus it's funny ..?
A:
Bob's Burgers "FM" references