A gentleman is permitted to join a private club. The initiation consists of holding an unprepared on-the-spot lecture, on a theme starting on a letter which is alotted to him.The man gets an S, and chooses to give his impromptu lecture on Sex. Coming home and reporting to his wife, he chickens out and says that he spoke about Sailing.The next day, his wife meets a club member who says her hubby gave a very good lecture last night -hawhawhaw. Wife: "That's strange, I must say. He has only done it twice. The first time he got sick, and the second time he lost his hat."