The ice bock, also known as "Bayrisch Gefrorns', owes its discovery to a coincidence. According to the chronicles of the Kulmbacher brewery, some time around 1900 an apprentice forgot on a cold winter day to carry two barrels of bock beer into the brewery cellar. The barrels stayed outside, were covered by ice and snow and weren't discovered until the following spring. The barrels had burst and the apprentice was reprimanded. But the carelessness was a stroke of luck because under the thick ice coat, a bock beer extract remained, strong tasting and high in alcoholic content.