An elderly couple is having breakfast. The woman says: “Oh, I had the most wonderful dream: I was 20 years old again and I was cycling through a beautiful forest with my sister.” The man replies: “I had a wonderful dream too: I was 20 years old again and I was making love to a beautiful girl.” The woman winks and asks: “were you making love to me?”, to which the man replies: “Of course not, you were out cycling with your sister.”