citrus

Sherlock Holmes: [sarcastic] Oh, you meant "spectacularly ignorant" in a nice way! Look, it doesn't matter to me who's Prime Minister, or who's sleeping with who--
John Watson: [somewhat bitterly] Or that the earth goes around the sun.
Sherlock Holmes: Oh God, that again! It's not important!
John Watson: Not important? It's primary school stuff! How can you not know that?
Sherlock Holmes: Well, if I ever did, I've deleted it.
John Watson: "Deleted it"?
Sherlock Holmes: Listen: [gets up and points to his head] This is my harddrive, and it only makes sense to put things in there that are useful. Really useful. Ordinary people fill their heads with all kinds of rubbish, and that makes it hard to get at the stuff that matters! Do you see?