People that don't understand that you aren't listening to them and just keep talking.
This is how it goes:
-Coworker comes into my office and wants to tell me about something they feel is interesting.
-Yenta babbling commences.
-I continue to stare at my laptop screen and don't respond, nod, or anything.
-Person continues babbling as if I am mesmerized by their every word.
-Now I can't concentrate on Puck's annoying banner postings or all the excrement on amazon I want but don't need.
-Want to say, "SHUT THE freak UP, I DON'T CARE!!11ONE!11", but I am too nice.
-Continue to stare at screen and now occasionally quietly say "mmmmhmmm" or "ahhhh" in hopes they just wanted to get my attention and will then go away.
-Person doesn't go away and continues to talk about stupid excrement.
-Now I'm mad, not just annoyed. Still too much of a puss to be honest.
-Consider farting to clear the room, but can't muster up a stinker.
-Sit and mentally punch person in their baby-maker until they finally go away 15 minutes later.
-Fume over this for 5 minutes until relaxed again.
-Yenta returns to tell me something they forgot to mention.
-Mentally kill myself.