In 1814, London was hit by one of history’s strangest industrial disasters: a flood of beer.

At the Horse Shoe Brewery near St. Giles, a huge wooden vat filled with porter suddenly burst. The rupture triggered a chain reaction, breaking more vats and unleashing a wave of beer into the surrounding neighborhood.

This was not a goofy pub mishap. The area nearby was crowded and poor, with families living in cramped basement rooms and small houses. The flood reportedly knocked down walls and rushed into homes. Eight people are generally recorded as having died in the disaster.

A court later treated the event as an accident rather than a crime, and the brewery continued operating for decades afterward.

It sounds like something invented for a tavern joke, but the London Beer Flood was real—and for the people of St. Giles, it was terrifying.

History’s weirdest disasters don’t always arrive in fire or smoke. Sometimes, they come on tap.