Easily Annoyed?

Ever notice that if someone is doing something, such as clicking or whistling, that you tell them to stop automatically? What makes us do that? Is it the stress of what we were working on that caused on to release our anger someplace else, on the person? Humans can’t work with a lot of noise, or the absense of it. It’s just like a heart beat, throbing annoyingly to the point where you want just to rip it out, but you can’t live without it. Try just tapping your foot repeativly, for about a minute or so, then stop. Don’t you feel an absense of something? It’s like our bodies start feeding off of it, using it to do something, and when it stops, it doesn’t know what to do, you just feel… an absense. People can’t even sit still without doing anything for a minute, let alone a few seconds. We have to try to do something to distract ourselves. But from what are we are distracting ourselves? Of what are we so afraid?