I am sure that everyone would know the pain of knocking at the door knob. You are having the same pain like everyone is having. It's like a wake up call telling you that, the door knob is there.
Some pain just is also accidently hit on, can you tell me whats that? Its something to do with you toes! Yeah sometimes you get hit on something. I remembered I always hit on the door as I am opening the door and my foot is there. The pain is terrible and worst is that my toe's nail will come up.
No joke, I am telling you the truth, my experienced. What's yours?