Open iTunes and then select "About iTunes..." from the application menu. The text scrolls upwards, but if you hold the Option key, the text will scroll backwards. You can even tap the Option key if you like, to "scratch" the text along with your music, like a DJ would a record.
[Editor's note: This has absolutely no effect on my iTunes 3.01 installation in 10.2.1 on my G4/733 with the Apple keyboard. But it worked as described on our iBook. Odd!]

