Have you ever ran into someone you had sex with and didn't remember that you have? Was it awkward when you suddenly remembered who they are?

I recently had a guy come up to me and say hi, at a store. He introduce me to his young son. I had no idea who he was, I did not recognize him. He then said his name and while I did not recognize him (he had changed too much) I remembered his name.

This was rather awkward, especially since his wife came up next and he introduced me as a former friend.
Have you ever ran into someone you had sex with and didn't remember that you have? Was it awkward when you suddenly remembered who they are?
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