Another, which wasn't part of the e-mail but a good poser which was set by Chris Evans when he was on Radio 1 many moons ago:-
Once, in UK singles chart history a song at number 1, was knocked off the top of the charts by a song who's title appeared (in full) in the lyrics of the song it replaced.
Name the titles of both songs and the artist/bands.
As i said, this question is several years old but as far as i am aware it has still only occured once.