something similar happened on criticker, there was this senegalese movie called XEW XEW and all the ratings were either 10th tier or 1st tier with nothing in between, and there was just one review saying "the only masterpiece in the history of cinema" - then some people noticed this and jumped on the bandwagon etc, but nobody was sure if any of these ratings were serious or if the movie even exists. a lot of the info about it on the internet is contradictory and misleading, i.e. AMG confuses it with a french film of the same name, IMDB used to conflate it with some other movie etc. i think some people have claimed it was shown at a festival in brazil or something and given realistic seeming accounts of it though.