Wine, Pepsi, Coke...

People said they liked Pepsi, labeled M, better than Coke, labeled Q. Irritated by this, Coca-Cola did their own study and put Coke in both glasses. Again, M won the contest. It turned out it wasn't the soda; people just liked the letter M better than the letter Q. - 'You Are Not So Smart': Why We Can't Tell Good Wine From Bad