Methane gas produced by 90 farting and belching cows caused an explosion in a German dairy farm, blowing the roof off. Shouldn't laugh, but..
http://www.huffingtonpost.co.uk/201...as-explosion-german-dairy-farm_n_4678584.html

http://www.huffingtonpost.co.uk/201...as-explosion-german-dairy-farm_n_4678584.html