Rule 27

Never knowingly be serious. A rule created by the Doctor in the popular BBC series Doctor Who during the series 6 episode "Let's Kill Hitler".

(The Doctor comes out wearing a tux and a top hat.)

River: You're dying! And you stopped to change?

The Doctor: Oh, you should always waste time when you don't have any. Time is not the boss of you. Rule 408. Amelia Pond. Judgment Death machine. Why am I not surprised? Sonic cane.

River: Are you serious?

The Doctor: Never knowingly. Never knowingly be serious. Rule 27. You might want to write these down.

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