Pet peeve time:
Get back from the restroom. Sit down in my office at my desk. Before I have time to even unlock my computer, a loiterer is waiting. I start looking at an e-mail. He says, "I'll wait until you have a free minute."
He'll wait at my desk.
"Since you're standing there now, what's up?"
I then proceeded to nod and say "uh huh" for 5 minutes until he got the hint and walked away.
Don't fucking loiter and put people in that situation write an e-mail or IM like a normal person, "got a minute?"
Unless you're a Full Bird Colonel, my Commanding Officer, or sport a Silver Star(s) on your shoulders....get da fuck outta here!