A KBO player broke the cardinal rule of bat flips: Don't hit the umpire with the bat

You might think that flipping a bat is easy -- "Sure, I could stand there and throw a piece of wood in the air," you might say -- but you'd be wrong. Do you think Jackson Pollock was just throwing paint around? That Andy Warhol was just hanging out by a Xerox machine? No, a bat flip involves plenty of artistry and skill. You need to take into account the game situation, the direction and strength of the wind, barometric pressure, wrist flexibility, weight of the bat and about 1,500 other mental calculations in a single moment.
For Lee Bum-ho of the Kia Tigers in the Korean Baseball Organization, he made a terrible miscalculation. After drawing a walk, he went with the bat flip -- a questionable practice to begin with on a walk -- only now he flipped it end-over-end directly onto the umpire's head. 

But just as it takes thousands of hours to become a professional baseball player, it also takes that same amount of time to become an expert bat flipper. I'd expect Bum-ho will be spending a few extra hours in the cage working on his flips.