I don't like the fact my pannier is so heavy at those tills, you can ask them to zero the scales, but even then after a few items it then asks for assistance again! Or you just put everything on the scales and only pack your bag once you are finished with lots of evil eyes staring at you because you didn't do it as you went along!
However I do admit to reading the paper of the person in front of me on the bus today who seemed really interested in that page, I couldn't be bothered to get my own.