The awkward moment when a guy sits at the table next to you in a fairly empty Starbucks and keeps looking down at his computer then looking your way (like does he have some kind of tick?), and you wonder if he's waiting for someone and keeps looking towards the door, or starring at your computer screen making you paranoid that he might be gathering info about you. So you stare back to give him the hint to grab some social skills.
I kept looking at the door because I felt nervous and creepy, and just thought I should leave embarrassed...