One summer in college I worked at a department store. One of our VPs used to actually cover the first floor as undercover security. One day, he held the door open for a guy carrying a microwave oven. It turned out to be a shoplifter and our security guys WHO WAS ALSO AN EXEC was on tape holding the door open for him.
LOL! That happened to me first day in Charlotte, NC. Went to a corner store to get to some beer and held the door open for this guy coming out. Once I got inside the clerk is gasping like a fish out of water and pointing at the guy I just let out saying he just robbed her.
I'll admit, it was funny at the time :-)