Everybody at some level works out their relationship to various famous people. I had known for some time that I was related to Kevin Costner through my Mom Anita Costner, we're 7th cousins. That's not surprising based on the fairly easy mapping of last names.
Now some of us that spend too much time on this remember names, but I still thought it was weird when I recognized William Knowlton from Ipswitch, MA in Family Tree magazine connecting me to two other actors.
Some years ago I knew I was related to Virginia Piper, a socialite that was kidnapped and murdered, and whose kidnapping was one of the inspirations for the movie Fargo.
Tonight I'm rewatching All The President's Men and there is a scene where they contact Kenneth Dahlberg and he says his neighbor's wife was just kidnapped. Dahlberg lives in Minnesota, so I Google the combination and sure enough Virginia Piper and Kenneth Dahlberg are neighbors.
For some reason none of my other relatives saw the connection, or they just thought I had too much time on my hands.