The oldest example of the stifled yawn and the impossible sneeze was discovered in masks found in ancient Greek ruins. They were later wrongfully suggested to represent comedy and drama. :) :(
The whole thing about the story has been hapnin to me daily for 20 years. I came to reliase that my friend is just very bad mannered so what i do now is still tell my story even if he has moved on. When he interupts i either keep talking so that we r both talkin at the same time or i continue where i left off as soon as he shuts up. He always finishes with a question and i ignore the question and continue what i was saying. If anyone else was listening they would say wtf kind of conversation is this... i think i need to sack him actually