I have uncles who are twins; both born on the same day, same year
kidding aside, very similar lives - both got married young and divorced on the same day without telling each other. Both remarried women with the same first name. Both suffered similar injuries later in life.
identical twins separated at birth lead to some amazing coincidences which points toward the importance of genetics in shaping us. Classic case study of two twins separated at birth, one raised as a nazi in the holocaust, the other a jew in the caribbean. When reuinited later in life both wore the same style of wire rimmed glasses, read magazines from the back cover to front, liked to sneak up on people and sneeze to startle them, enjoyed spicy foods and flushed the toilet before using it.