The worst is at the freakin' grocery store. If you have to go to the aisle with a cashier, they ask for your store-brand 'saver[slash-spyware] card'. If you tell them you don't have one it's usually followed by a "would you like to sign up..." "No, thank you." and then a "Can I have your phone number" at that point I'm annoyed. I am just trying to buy some Golden Grahams here lady you don't need my phone number, no I'm not giving you that.
I actually had one poor girl look at me like a lost puppy at this point. I don't think she'd ever had anyone decline before - and that scares the hell out of me. She had no idea what to do, the register wouldn't continue the transaction without inputting a phone number. After a few seconds of her staring at me bewildered I had to suggest she try just holding her finger down on the 1 key.