Grumpy Goose

WTF? All I see is a "Has your office evolved?" Microsoft commercial. :cool:
 
This is their birthing season. That behaviour almost assures that there's a nest on the roof, I've seen them do it before. The adults of that species are extremely protective.
It's funny to see people run from geese though. You'd think they had razor- sharp teeth or something. The only way they can really give you a little reminder is with a good whack from their "shoulder" bone near the upper front edge of the wings. Just watch out for that and grab them by the neck.