That happens to me all the time during the school year. It was usually when I was in the computer lab around 6 AM. There would be this annoying hammering in my ears... the guy never actually sat next to me but you could see EVERYONE in the lab getting annoyed. You can't really get up and walk out of the lab though because... well, you really need to get your work done.
You can help the HubPages community highlight top quality content by ranking this answer up or down.