I worked on the checkouts in a Tesco one summer. The number of times I must have said "Have you got a clubcard?" — you're supposed to always ask the customer if

I worked on the checkouts in a Tesco one summer. The number of times I must have said "Have you got a clubcard?" — you're supposed to always ask the customer if they haven't already produced one. I think it's to get people who don't have one to get one just to shut up the assistant.