Receipt checkers

On my trips to Wal-Mart I always secretly hope they will try to stop me because I usually don't show my ticket, as in this story, just so I can freak out on them and yell about unlawful detainment, lawsuits, etc etc. But the employees at the local big box are usually pretty lackadaisical about it. That's probably for the best, as I would not want to get banned from the closest one, but it still leaves me itching sometimes.