Many years ago, when Moshe was a young boy, he found a mezuzah on the wall of a deserted house near his street. As there was still time before he had to get home for his tea, he pulled it off the wall and opened it. Inside, he found a piece of old paper on which was written words that he would never forget: “Please help me. I’m being held prisoner in a mezuzah factory.”
From Oy! The Ultimate Book of Jewish Jokes, by David Minkoff