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Didnt El Diablo challenge anyone to be able to taste the difference of 5 high end vodka's of his choosing?
It was awhile back so I dont feel like searching for the thread but no one would take him up on the offer.
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I have no doubt that someone with a very trained palate could do this, but I would be surprised if it's anyone here. That guy on Mythbusters who was able to put the cheap vodkas in order of how many times they had been through a filter comes to mind, but you'd have to be that good to be able to do it.
I believe this is the Grey Goose article in question. If not, it gives you an idea of what's really behind it.
The Man Behind Grey Goose