This has happened to me a couple of times recently. Each time in a shop just buying something really mundane like shampoo or tea.
Today I was buying a coffee gift set for a friend and got to the till.. Assistant asked if I had one of their "points" cards and would I like one. Thinking it would be something quick and painless I said "ok", expecting it would be the kind of thing where your card just gets stamps each time you shop there or something.
Assistant wanted my name (fair enough), but then also my address, email, phone number and DOB.
It was a busy shop and I'm uneasy about giving out so much personal data just for the sake of saving a few pence off my next purchase.
I asked the assistant to stop processing my "points" card and just let me pay for the item and leave in the end as she was faffing around asking for so much and struggling to spell my name, address and email. Sigh.
Other people get frustrated by this kind of stuff in a shop?