Top 15 Siamese Twins You Won’t Believe Exist. Although most twins are born without any complications, there are some who face unprecedented and unique birth situations. These twins resemble one another but are not born separately; instead, they are physically joined to each other owing to a rare condition. This condition is known as Siamese twins and in this video, we will introduce you to some of these conjoined twins who will blow your minds. Here are the top 15 Siamese twins whose existence may astound you. || Posted by CZ