Nice Girls Don't Get Things Done.
There's a certain point at which being polite to some co-workers makes me look less than competent in front of others. Letting your unscheduled meeting linger for "just 3 minutes" in the meeting room that I reserved means that, at best, I lose the opportunity to open meeting documents on the projector. At worst, it means that my meeting runs over into the next one.
Now that we understand each other, get out of my meeting room. And don't get me started on proofreading your copy.