Credit card companies using similar tastes of others to judge you.

I hate credit card companies. I think I'll go watch the end of Fight Club again... From ABC News:

A new policy being used by at least one major credit card company judges a shopper not necessarily by his credit purchases and payments alone, but also by the fiscal behavior of the fellow shoppers in the stores he visits.

And in some cases, the bad repayment history of the guy behind you in line at your local megastore could result in a reduction of your credit line, which, in turn, could lead to a reduction in your credit score -- all because of where you shopped.