Why. . .

There are times when you are engaged in something which needs you to stand close to the wall, stare at it, you have nothing running in your mind and all you can do is to look at the ground once in a while. And there is a guy who is standing right next to you doing the same thing. How often do you turn to see who it is? A lot? Most times?
Why do you do that? How does it make a difference who it is?

:)