A pair of twins in England who were separated at birth got married without knowing they were brother and sister. They were adopted by separate families, and neither was told that they had a twin sibling. Uh... ewww!
You can read the whole ordeal via BBC News UK.
Those two people are going to be scarred for the rest of their lives. They didn't know they were siblings until AFTER they got married. Obviously, they fell in love with each other... now, they're brother and sister. How exactly are they supposed to deal with that? They can't just press a button and fall out of love.