A carburetor walks into a bar…

some inmates are sitting at dinner eating with everyone else in complete silence. New guy asks under his breath "WTF, why is everyone so quiet?", "Its the rules...." then he shouts 42! everyone laughs and it dies down, then someone shouts 36! and a few more chuckles are heard. Then someone shouts 12! and the place erupts with laughter. Now the guy is clueless. "What are these numbers?" They are jokes we remember and this is the way we can tell them without being punished. So the new guy shouts 17! And nothing....11! still, not a murmer. "Why isn't anyone laughing? he whispers...old guy looks at him and says "..some guys tell jokes better than others."