We’ve heard this called a cannonball and a can opener too, but we’ve always gone with bomb drop. Whichever way you call it, it’s a fail.
Besides teutonic foolishness, this fail does exhibit a certain self-belief. The guy has no way of knowing whether he has the body weight to crack the surface of his frozen pool, but he goes for it with utter conviction.
That may be why he just about breaks his arse.