Always take a banana to a party.

Demons run when a good man goes to war.

Never ignore a coincidence. Unless you're busy, in which case, always ignore a coincidence.

Brainy's the new sexy.

Though the man above might say hello, expect no love from the beast below

We have a plan to top it. And I do think our plan is devastating. We’ve practically reduced our cast to tears telling them the plan … we’re probably more excited that we’ve ever been about Sherlock.

The Doctor: [aiming gun at the ceiling] Didn't anyone ever tell you? There's one thing you never put in a trap if you're smart. If you value your continued existence, if you have any plans about seeing tomorrow, there's one thing you never, ever put in a trap. Angel Bob: And what would that be, sir? The Doctor: Me. [fires]