There's a lot of youtube going on in the youtube comments. Unfortunately it looks like they deleted the guy who was trolling about United Statesians being retarded for filming sideways and then went off about guns. He was up to some AAA stuff and had over a hundred angry replies.
Back when I was in high school we had a particularly dumb cat who would do this a few times a day. You had to actually reach through the doorway and wave your hand in front of her face to convince her it was open, and even that didn't always work.