Invented in a pub in the 1970s, toe wrestling plays out very much like a traditional arm-wrestling match.

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Bill Gates or Mark Zuckerberg may not be able to best you at arm-wrestling, but they could buy and sell you a thousand times over.

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At that point the fluid-dynamics equivalent of a titanic arm-wrestling match will get under way, with the surface vessels' pumps trying to push the mud down the well while the rising oil tries to push it out.

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Jeremy Brown, who was graduated from MIT in 1995 and got a PhD there in 2002, remembers when a student broke her arm in a mud-wrestling pit at a party.

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