A funny one, from the PRC in the 1980s…
My Bejing local guide asked if he could give a short overview of Chinese History on the bus ride out to the Great Wall. Having taken the (somewhat boring) ride many times, I said Thanks, that would serve as a diversion. He told me he was a History Professor, but since his English language skills were very good, the government had taken him from his classroom and mad him serve as a guide. He turned out to be a wonderful speaker and the group was spellbound. When he finished, one of the ladies in the front voiced how much everyone had enjoyed his presentation, saying it was hard for us to get a handle on Chinese History. He smiled and said even he had trouble, since the Party officials changed it so often.