How are you supposed to pick a good shopping trolley??? They all work perfectly when they are empty but as soon as it is half loaded it develops an annoying squeak and the wheels decide to go their own separate ways. Add to that the frustration of being held up behind the undecisive shopper who leaves their trolley in the middle of the aisle while they spend five minutes trying to choose between three ply toilet paper with pictures of labrador puppies or two ply scented with jasmine. It's not over until you have queued for ten minutes only to find you have just scored a trainee checkout operator who doesn't know the PLU code for broccoli. I hate shopping!