I read of an incident -WWII - when the station chaplain saw a bunch of chaps in the gymn, larkng about with a ' medicine ball ' ; said chaplain decided to join in for jollity, and mistook the ball for a football or similar and gave it a really hearty kick...
The cracking of his ankle bones was very audible, as moreso were the expletives, which left even the groundcrew astonished.