Reproduced below, an actual email from Amazon.
I think their logarithm failed them this time.
Dear Amazon.com Customer,
We've noticed that customers who have purchased or rated books by Country Home Books have also purchased A Weighting Scheme for Security Patterns Using Mobile Agents by Jessie Walker. For this reason, you might like to know that A Weighting Scheme for Security Patterns Using Mobile Agents is now available. You can order yours for just $76.00 by following the link below.
While I'm sure this is an utterly fascinating tome,
no. No additional purchase happening here. What the????