to listen to people at work... and not just the boring people who tell me about the article they've read in the daily mail, but also the people who i actually consider to be 'friends'.

they'll say something, i'll look at them, catch the first ten second of what they say and then the next thing i know, they're looking at me expectantly and i have to just mutter "yes i agree" or something, blush, and stare intently at my computer screen until their confused gaze is off me.

this only happens at work.... does anyone have any ideas why this is happening?