The thing I find most annoying is the Break In Neighbor! They never knock, they don’t announce themselves, or even ask to come in. They just burst in the front door and start talking! This was most noticeable in Seinfeld because it was a running Kramer joke, but it’s been going on since Fiona, the apt. neighbor from Good Times, in the 70s! I have never lived anywhere where someone could just run up in my house or apt. whenever they felt like stopping in. My closest friends still need to knock!