Not me, but a relative of mine just found the son he gave up for adoption when the dad was a teenager over 40 years ago. Talk about shocking news in our family!
The cool thing is the son looks exactly like another relative - from what I've heard of the story, there was some back and forth between the dad and son to make sure everything was legit before they exchanged contact info, but once everything was verified to be true and they got pictures of each other, the first thing the dad did was tell the son to go to the 3rd relative's FB page and look at the pictures. The son came back and said the resemblance was "scary similar" (in a good way lol) He said it was emotional because since he was adopted, this was the first time in his life that he actually looked like someone, much less so closely!
As far as the actual DNA test, I guess ancestry.com comes back with the DNA matches from it's database and says how much of a % match you are to the other people with your DNA. In this case, the dad got a message that this person (his son) was almost a 100% match and it was "extremely possible" that the person was a parent or child to my relative. The son had gotten the kit as a gift and took it 2 months prior. What a coincidence that they both did the kit at almost the exact same time!