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[The Doctor faces the camera of his journal towards himself with a determined, serious expression. He holds up one finger.]

I've got quite a bit on my mind, and I'd prefer not to lose my temper... however-

[He turns it away, to show his TARDIS painted pink.]

I know the old girl wouldn't choose to do this to herself! Who's responsible?! Someone must be, because usually I can simply move into the vortex with her and when she returns her appearance is restored from whatever graffiti and defacement has occurred. This has been positively impossible to remove.