All day, every time someone comes to speak with me in my office, my boss comes over and stands in the doorway, cutting them off, and talks to them until they go away.
Maybe he's just bored, but it's driving me nuts! Not only would I like to say hello to some of these people, but I have work to get done and listening to him chit chat for 20 minutes is not helping my productivity today.
EDIT: I'm quitting smoking, so take everything I say about people annoying me with a grain of salt. Although, in general, I'm annoyed fairly easily by people. All back to that introvert thing