I read this on mentalfloss. I would have loved to have seen pictures from this. It's still really hard for me to imagine this story happening.
The Industrial Revolution wasn't all steam engines and textile mills. Beer production increased exponentially, as well. Fortunately, the good people of England were up to the challenge and drained kegs as fast as they were made. Brewery owners became known as "beer barons," and they spent their newfound wealth in an age-old manner -- by trying to party more than the next guy.
Case in point: In 1814, Meux's Horse Shoe Brewery in London constructed a brewing vat that was 22 feet tall and 60 feet in diameter, with an interior big enough to seat 200 for dinner -- which is exactly how its completion was celebrated. (Why 200? Because a rival had built a vat that seated 100, of course.)
After the dinner, the vat was filled to its 4,000-barrel capacity. Pretty impressive, given the grand scale of the project, but pretty unfortunate given that they overlooked a faulty supporting hoop. Yup, the vat ruptured, causing other vats to break, and the resulting commotion was heard up to 5 miles away.
A wall of 1.3 million gallons of dark beer washed down the street, caving in two buildings and killing nine people by means of "drowning, injury, poisoning by the porter fumes, or drunkenness."
The story gets even more unbelievable, though. Rescue attempts were blocked and delayed by the thousands who flocked to the area to drink directly off the road. And when survivors were finally brought to the hospital, the other patients became convinced from the smell that the hospital was serving beer to every ward except theirs. A riot broke out, and even more people were left injured.
Sadly, this incident was not deemed tragic enough at the time to merit an annual memorial service and/or reenactment.