I love Amazon’s customer proximity scan system, where they tell you that other people who’ve bought that have also bought this. Genius. But then sometimes:

Greetings from Amazon.co.uk,

We’ve noticed that customers who have purchased or rated music by Blue Man Group have also purchased Billy the Hits by Billy Joel. For this reason, you might like to know that Billy the Hits is now available. You can order yours for just £19.99 by following the link below.

(Blue Man Group) ∩ (Billy Joel)? Really?