Conjoined twins are twins whose bodies are joined together at birth.
Conjoined twins are natures oldest two-fer, but having being one always a great deal. The survival rate is pretty low (5%-25%) and separation usually means one twin will have to die since they normally share organs. If the twins live into childhood many will lead unhappy lives marked by ridicule and pain. Not Chang and Eng Bunker, though.
We call conjoined twins Siamese Twins
because of these two men who were, you guess it, conjoined. The men were born in Siam (now Thailand) which gives us the name, although they were three quarters Chinese. P.T. Barnum decided people would pay good money to see Chang and Eng and they became stars of his traveling sideshow circus in the early-to-mid 19th century. But that's just where the story starts.
After their contract was up with Barnum the twins moved to Wilkesboro, North Carolina, which they had visited with Barnum previously. They bought a plantation and, even stranger, bought some slaves. After all, Chang and Eng made quite a bit of money on the road and could afford such luxuries. But something was missing...they needed a family. So Chang and Eng married sisters - Adelaide and Sarah Anne Yates, respectively - and the dual union produced...wait for it...twenty-two children! Two of their kids even went on to fight for the confederacy in the Civil War...whoops!
Chang and Eng died on the same day (thank God) in 1874 at the ripe old age of 63. They shared a liver which was removed from their body and preserved for all to see. After all, it was the liver of the most famous conjoined twins in history and the source of oft used term, Siamese Twins
Chang and Eng produced and average of 11 children per penis, an impressive number.