FAIL: Album Cover Guesser
I was using the Amarok "Album Cover Manager" tool to fill in the missing cover artwork in my music collection.
It has a "Fetch Missing Covers" button, which goes to Amazon and retrieves the artwork it needs. The lookup often makes mistakes, particularly because I tagged artists in a discouraged "Lastname, Firstname" form. Still, it's easier to fetch them all, then go back and manually fixup the ones it got wrong.
I ran it over several hundred albums. It made a lot of mistakes, but none quite so hilarious as the one to the right. The album cover you see is what it selected for London Calling by The Clash.