The NFL has announced that Paul McCartney will be performing at halftime during the Super Bowl in February. No doubt he was chosen as a "safe bet" after the overblown Janet Jackson fiasco last year. I wouldn't really like to see it, but I would love for McCartney to do a Jim Morrison-esque show by dropping his trousers. It would be a hilarious slap in the face to the "family entertainment" NFL.
If John Lennon were still alive, I doubt that they would invite him to perform. In a time of war, I think he would have to make some sort of statement that would probably offend the pro-establishment NFL bigwigs.