"Fog everywhere. Fog up the river where it flows among green airs and meadows; fog down the river, where it rolls defiled among the tiers of shipping, and the waterside pollutions of a great (and dirty) city.... Chance people on the bridges peeping over the parapets into a nether sky of fog, with fog all round them, as if they were up in a balloon and hanging in the misty clouds."

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The main trend with the theme episodes is that anywhere there is a misconception about the way the physical world works, we're finding fertile material. Whether it's in a phrase like "going over like a lead balloon" or "a needle in a haystack," or tackling movie myths or even a genre, like MacGyver or James Bond, we're finding that all these things can lead to people believing the world works in a certain way. It might not be correct, but we can test out if it's true.

— Adam Savage