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 ..?