He's no longer among us, but when I had him, my Sheltie, Mio, had a ridiculous obsession with doors opening. Especially the front door.

He didn't do it all the time, but on occasion when someone would open the door, Mio would flip out. He'd run up to the door and get his muzzle in as close as he could to the door when it oppened, barking and whining. Thing is, he wouldn't go for the actual opening part of the door - it was always the hinge side he'd freak out on. So here you are opening the door and this streak of grey and white flies past you and jams hims muzzle into the crevice formed by the back of the door and the wall.

He never had trouble with people and was actually a stellar obedience-trained dog. He was just... Special sometimes