He's laying in his bunk when the lights go out. After a few minutes, he hears someone shout, "13!" followed by a chorus of laughter.
Another few minutes go by and he hears, "27!" followed by more laughter.
"What's going on?" he asks his cell mate.
"Well, we've heard the same jokes so many times, we just gave them all numbers so we don't have to waste time repeating them."
A little more time passes and then someone erupts, "34!" to a few guffaws.
The man decides to try and join in by yelling, "19!"
He is greeted by silence. He asks his bunkmate, "Why didn't they laugh?"
His bunkmate replies, "You didn't tell it right."
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