Oh, yes. Another groaner --
A woman has twins, and gives them up for adoption. One of them goes to a family in Egypt, and is named 'Ahmal.' The other goes to a family in Spain; they name him 'Juan.' Years later, Juan sends a picture of himself to his birth mother. Upon receiving the picture, she tells her husband that she wishes she also had a picture of Ahmal. Her husband responds, "They're twins! If you've seen Juan, you've seen Ahmal."