And what is behind door number one?

I don’t know why I never think there will be a person on the other side of the door. When I enter or leave the bathroom at work I open the door with vigor. I barrel in or out so to speak. And every time there is a person on the other side I jump. And I almost knock them down because I am concentrating so hard on opening that door and getting in or outta there. I would say about 45% of the time there is someone there. You think I would be use to it by now and not jump and scare us both. Or not barrel in and out. Oh what ever. Does this happen to anyone else? Am I alone here? Are you all the kind of people I am knocking over and scaring?