Chang and Eng: The Original Siamese Twins
Chang and Eng Bunker were conjoined twins born in Thailand in 1811. The brothers are the reason conjoined twins became known as Siamese Twins because back then, the country was still called Siam. As in: "Are you the King of Thailand?" - "Yes, Siam!" They came to the USA around 1830 and toured as a curiosity act. Then, in 1839, they settled down in North Carolina, became US citizens, and married a pair of sisters.
Between them, Chang and Eng fathered a staggering 21 children. We don't even want to think about how that worked! To paraphrase Joey from Friends "Eyes open or eyes closed?"... Candles on, or candles off?