Lord Alton of Liverpool spoke of an example of why UK laws covering human fertility and adoption should be changed. Here's the strange case of a twin, separated at birth, who ended up marrying each other:
"They were never told that they were twins," he said during the Dec. 10 debate on a law covering human fertility and embryology. They had been adopted by separate families and "met later in life and felt an inevitable attraction, and the judge had to deal with the consequences of the marriage that they entered into and all the issues of their separation."
Link - Thanks Tiffany! (Photo is of David Alton, who spoke at the House of Lords about the case)