...Oh no, don't tell Crowley, he'll want to steal a submarine.

[ He starts to pace internally, which externally just looks like a lot of fidgeting. ]

We'll have to tell him it's something else, not just the submarine. The captain must be, yes, the captain must be fingerprinted or wield some sort of special magic--

[ He flounders, grasping desperately for straws. ]

--Oh, I can't lie to Crowley, he'll figure it out right away.