I've heard this one a bunch, but it seems to be really hard to find the source. The closest I have found was that it was a study done bye Frédéric Brochet for his Phd in oenology (did not know that was a word until today)

http://web.archive.org/web/20070928231853/http://www.academi... https://en.wikipedia.org/wiki/Blind_wine_tasting https://www.theatlantic.com/health/archive/2011/10/you-are-n...