I have a couple of stories to relate .....geddit ??
My surname is Bickerdike and my fist wife's maiden name was Horsfall, both uncommon names even here in Yorkshire. When I first stard working on her line i found in the 1851 census a household in Huddersfield with a family of Horsfalls with a family of Bickerdikes as borders???
Later I married again ( don't worry I did it all legally) and my wifes maiden name is Thompson. As I researched her line I discovered her family were from Batley Carr decending from a chap called Smith Thompson, this led to lots of work on the family noting lots of names etc.
Well one day I took my new wife to meet my Great Aunt, a Vasey who had married a Thompson, there was my great Uncle and Aunt sittting having a cup of tea and chatting.
I asked my Uncle where he was born, "Batley Carr" he replied. "Was your fathers name Smith?" a look of surprised crossed his face " yes " he replied and "was your mothers name Norah?" I asked, even more surprised look on his face " Yes " he replied. " Well " said I "meet your cousin " and I pointed to my wife.
It turned out that my great Aunt had married my father in laws cousin.
The look on both their faces was a picture to behold and one that I will remember for a long time
Tim B