A world-weary, spiritually hungry man joins a monastery. They let him in on the condition that he take a vow of silence. He's allowed to speak two words every seven years. After the first seven years he says "awful draft." After seven more years of silence he says "bad food." Another seven years pass and he says "I quit." The abbott says to him, "That doesn't surprise me. You've done nothing but complain since you got here."
I only recently came across that joke, so I didn't realize what an old chestnut it was. I told it to a friend of mine tonight and he knew it beat for beat. That does figure. He's very devout and probably knows most of the Catholic jokes. Except maybe the obscene ones.