I can't stand them. Sometimes, I leave my door closed, and my sister just knocks and goes straight to opening the door. So that doesn't really make a difference. But people that come in my room and ask me what am I doing, you just want to go and say, "What the heck are you in my room out of nowhere for?" or "Can I help you?"
i thik parents tend to do this but they rele do have a right to do so cos it is their house at the end of the day. i don't usually knock when entering a room if i see the door open. it is only when the door is closed that i knock before i go into a room.
