Kinda reminds me of a taste test we did years ago with some sorority girls from a noted drinking school. They were sure they could tell if the "Ginnies" were made with Tanqueray--the way they always ordered them. When informed that usually, in a mixed drink, no matter what gin you order, you get the house brand, 'cause almost no one can tell the difference, they insisted they could tell.

So we ran a (very fun) taste test with marked glasses. Guess what, they couldn't tell. But, after a few G & Ts no one cared. ^