stillnot-ginger:

Doctor: Professor John Smith, University of London, here to check on the hospital’s research, don’t mind me, pretend I’m not even here.
Sherlock: Professor? Hmm. Tweed suit, suspenders, cheap loafers and a bow tie; I’d almost believe you except for one thing; that paper is blank.
Doctor: Is it? Hmm, would you look at that. Well it looks like you’re very clever, Mister Holmes, and that makes things much much harder.
Sherlock: And why is that?
Doctor: Well, un-clever people are very useful; they’re eager to help and don’t ask many questions, but clever people are very uncooperative and always think they’re right. It’s very annoying, and quite a hindrance when you’re in a hurry. I should know.

(Source: batcows)