You know, pretty soon we won't be allowed to buy anything in the bloody supermarket without being a member of their bloody club. Typical conversation goes like this:
Cashier: Do you have your (*insert supermarket name here*) club card with you today?
Me: Er, no.
Cashier: Would you like one?
Me: No thankyou.
Cashier: Did you know you could save money today?
Me: Yes, I'm fine thanks.
Cashier: It will just take 2 seconds to sign up.
Me: No it's ok, I really don't want my buying habits to end up in your database and my information sold to anyone you choose.
Naive Cashier: Oh sir, I really don't think we'd do that, we're just trying to save you money.
So I walked out and went next door instead - fuckwits.