I recently had the supreme honor of brewing at Willimantic Brewing Company in CT last week, and the brewer was telling us about a collegue from a brewery he used to work at. He said that while carbonating a tank something failed and caused the tank to constantly build up pressure. When the brewer was about to transfer the beer out of the tank, the door exploded off the tank and hit the brewer square in the chest. He flew 20 feet, and was killed.
The one lesson I took away from that whole day: Pressure kills. There are a lot of ways to get hurt in a brewery, but pressure, whether it be failed blowoffs/regulators or spraying hot caustic, is the number one way to get injured.