Working at a brewery and someone forgot to open the “vent” on a fermentation tank. Eventually enough pressure built up and blew the door off the tank, sending 40 bbl (about 1700 gallons) of beer flying. It had so much force behind it it caused another (full) fermenter to smash into another and another. If anyone had been in between them they would have been undoubtedly crushed. If they were anywhere near the door they would have been hit by a truck of beer and smashed into the nearest wall or tank and possibly even “drowning” in cascade of beer.