I don't know if this counts. I've a number of situations...

I have reason to believe my adult son is an aquaintance of my psychiatrist's own son. Obviously neither would realize my situation but it has made me uncomfortable a few times.

Worse still I know my father knows my psychiatrist on a professional basis. They are both faculty of the university medical school. I know my psychiatrist would never break confidence still it is uncomfortable.

But, the most awkward situation was in the hospital. One of the psych nurses is the best friend of my ex husband. He exused himself of any assignments to me but still I cringed each time I saw him. Even though I know he professionally couldn't say anything I still imagine he told my ex - who would have giggled at the news - I was in the hospital.