Slog tipper rob! sends along this fascinating-yet-horrifying report of male German soldiers spontaneously growing solitary boobs:
Dozens of soldiers it the Wachbataillon (German for man with one breast, you know how concise German words are) unit, which performs drill displays at official events, are developing breasts on their left side because of the way they drill. It turns out that repeatedly slapping your chest in the same exact spot with heavy rifles can stimulate glands to produce hormones and cause a condition called one sided gynecomastia. (I'm sure the Germans have a single word for it but I don't know what it is.) The condition has been diagnosed in 74 % of Wachbataillon members who have gone to army medics because of their "developments."