That's honestly one of the few things that can help me more than anything.
And I don't mind people spectating me online, but if one of my 'family members' enter the room (the only working computer is in the basement, where the laundry and other random things are), I instantly stop EVERYTHING and just swap between two or three random tabs, usually being the Steam store or the front page here. I stop due to two reasons: 1) I can't concentrate while people are physically around me when I don't want them to be, 2) They always try their hardest to annoy me or mock me.
People who make noise when I'm playing, especially irl friends on Skype, people coming into my room, trying to talk to me, anyone who specatates me makes me nervous (except a few), people logging in and out, anyone pming me.someone taking my beer is also really annoying.
One good girl is worth a thousand bitches - Kanye West