Although not a regular Wal Mart shopper, this has happened to me as well and it is really infuriating. I was in line at a register right across from the little old lady that works the exit doors. She saw me checking out and paying the cashier. Nothing beeped but she still had the nerve to stop me and ask for my receipt! At least a dozen people were able to walk right past her with no problem and not to be prejudice but compared to a lot of the clientele there, I wasn't the one that should have been stopped.