It's "The Best of Homer" month on Fox 5 DC, and one of tonight's episodes, "Homer's Phobia," featured the following joke:
Marge: Oh, Homer, look! Look, a TV Guide owned by Jackie O. John: Oh, you should see the crossword puzzle. She thought that Mindy lived with "Mark." Homer: Give her a break! Her husband was killed!
That's right, they aired an episode with a joke about the Kennedy assassination on the anniversary of said assassination! I think it was probably a coincidence, though the idea that the Fox 5 DC programmers know the episodes well enough to do it on purpose is appealling.