I worked with a sales guy once who would randomly come into my office and look out the window. Our entire office was Windows. There was a rumor that he was checking to see if his car was repossessed yet. As he had been caught selling knives over the phone in his lunch break half a dozen times.

When he came into my office he did not say a word or make eye contact. Just walk in. Look out the window. And walk out. Man that guy was weird.