If you've seen one you've seen Amal...

http://www.xent.com/feb98/0224.html

A woman has twins, and gives them up for adoption. One of them goes to a family in Egypt and is named "Amal." The other goes to a family in Spain; they name him "Juan." Years later, Juan sends a picture of himself to his mom. Upon receiving the picture, she tells her husband that she wishes she also had a picture of Amal. Her husband responds, "But they are twins--if you've seen Juan, you've seen Amal."