Allen who?

My wife and I went to a wedding last p.m. and at the reception were talking to two friends. At one point in the conversation, the wife of this couple  said that she had heard I was writing  a book. “What is it about John?” Responding with a remark and a technique  I call “shock humor” I say with all seriousness, “Penile enlargement.” At first taken aback but then finding the response very funny, she began to laugh. As we are laughing, the husband leans forward to discern why all the laughter, and asks, “Allen who?” I said, ” P. Allen Largeman. You wouldn’t know him.”