A couple guys at work both purchased Radiohead's new album, which was sold on the "honor system" / "pay what you think it's worth" approach. One of them purchased the album for $5 and the other for $6.

The weird thing is, one of the tracks on the $6 download has a brief bit of extra audio on the "15 Step" track. Check out the video. The difference occurs at about the 3:30 mark, and the $6 version clearly has a 10 second snippet from another song at the end.

Is this a glitch, or is Radiohead giving incremental bonus music based on what you payed?