I'm at work and walking up to a double door and saw someone coming from the other side. (Just to be clear, there is enough glass in this door that I'm in no doubt he saw me approaching the door too)

I got there first, and being a clement gentleman I pulled the door open and theatrically laid my arm out as if to say 'Please sir, step on through'. This man makes a point of stepping to his left, opens the other door and just swans on through without even a hint of recognition for what I'd tried to do for him. And I'm stood there like some kind of chump. It was absolutely incredulous. I'm literally shocked by what he's done.