Sharp as a bowling ball

We've seen it happen countless times in movies, TV shows, videos, and Three Stooges shorts: someone is rummaging through a closet when a bowling ball from the top shelf gets dislodged and bonks the poor shlub on the head. Fortunately for me it was only an empty box, rather than a 16-pound ball, but the fact remains that I have now joined the ranks of those who have suffered Closet-Related Cranial Impact. (I provided my own laugh track.)