My dad used to tell a joke about a bunch of soldiers sitting around the barracks.

One old guy yelled 31! - and the place broke out in laughter.  After a moment or two, another guy yelled 52! - and more laughter erupted.  Then a depressed-looking guy in the corner yelled 29! -- followed by silence.  He yelled again, 68!—and again, the room was silent.

The new recruit asked the guy in the next bunk what...
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