Speaking of buying groceries, I thought my wife was going to have a complete melt down in Walmart a couple of weeks ago. The self check out system was down so they were herding everyone to the cash register lines but there was still only like three registers open. The lines were backed up really bad. When she finally got up to the register the employee scanned in all her items but then hit the wrong button and errored out the entire sale and had to start over. I just backed up at that point so I didn't become collateral damage. I heard all about it for days after that....