I discovered that my great-great aunt on my dad's side had murdered her oldest child. The scandal it caused was covered in newspapers all over Scotland. She had a child while in prison, too and another when she came out, all to different fathers, I think. Nothing to suggest otherwise.
I was astonished to learn that my great-great grandparents on my mother's side were Romany. I am still trying to track down the name change documents and naturalisation certificates, but one of my cousins thinks she has managed to do that, so I hope to get copies from her.
Via DNA, I have reconnected to a couple of cousins I have not seen in decades, which is wonderful. I have also connected to a couple of 3rd cousins on my dad's side (I know very little about his family, as they wanted nothing to do with me after I was born - long story) and one of them provided me with a photo of my great-grandfather and that answered a question I had, as he was illegitimate and I wondered if he knew his half-siblings. Turns out he did, which is very pleasing.
I use ancestry. I do have a tree on findmypast, but I cancelled my subscription, as I didn't like the format they use. I don't know why, I just didn't. I have discovered a famous footballer, too, who I thought was just a legend. Its been great fun, even when I have been hitting my head off brick walls.