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Jonas Salk invented a cure for Polio, Alexander Fleming formulated Penicillin. Add to this list of giants: Allen Wittman, inventor of “Liquid ASS,” a smelly spray initially intended to be used in pranks.

Imagine the worst smell you can think of. Now imagine the scent of "butt crack…with a hint of dead animal." That's how Wittman describes his creation.

Funny? That’s debatable, but it now has another application and is being used by the US military to acclimate medics to the smell of a torn intestine leaking waste.

Invented when he was a teenager messing around with a chemistry set, Allen also found a use for it when he was fired from a truck manufacturing company. Whitman and his co-worker Andrew Masters spritzed the office with "an eighth of an ounce" of the stuff, according to NextShark. Engineers fixed the water main, replaced the microwave, removed the carpet, and blocked off the bathrooms without discovering the source of the smell.

After that, the pair spent $36,000 to offer Liquid ASS to consumers. It's now selling along with Whitman and Master's other products: BARFume, Tex-Ass, and Fake Dog Poop.

Buy “Liquid ASS” for $10 on Amazon