So Joe is staying in a big hotel, and he sees a si

So Joe is staying in a big hotel, and he sees a sign that says "Comics Convention" outside one of the ballroom doors. Out of curiosity he goes in, and sees a bunch of people sitting silently. Then one of then stands up and says "34!" and they all laugh uproariously. Another person stands up and says "67 ! ! ! " and hilarity ensues.

Joe asks the conventioneer sitting next to him what's going on, and the person says "We all know all the jokes, those are the numbers of each one."

So Joe decides to give it a try. He stands up and says "43 !" and no one laughs.

Puzzled, he asks his neighbor what happened, and the guy looks at him disgustedly and says "It's all in the delivery."