Amazon Prime
I have ordered a few things from Amazon over the past month, I checked my bank statement yesterday and saw a payment of £79 for "Amazon Prime, to which I never signed up (it is supposed to guarantee slightly quicker delivery times on all orders or something).
I rang the bank to ask what it was about, and - sort of off the record - the lady told me that this had happened to her as well and she knew of plenty of other instances, apparently Amazon trick you into signing up to this somehow and somewhere ...