The awkward moment you wave to an old summer school friend and the don't remember you so you kinda look like a retarted welcoming clown.
                                Or.....

The awkward moment when you're in a crowed hallway, and you're waiting for a friend who's class is on the other side of the hallway, and wait for the entire break, and once the crowd is gone, you relise that they were at the end of the other hallway, waiting for you.

gack, i should update more...