The Pepsi Challenge has LOTS of faults and isn't a great example. I believe that one of the "debunkings" about the Pepsi Challenge was that people preferred th

The Pepsi Challenge has LOTS of faults and isn't a great example. I believe that one of the "debunkings" about the Pepsi Challenge was that people preferred the initial swig of Pepsi but preferred Coke if the question was asked after more consumption, after the beverage had warmed up, etc. Effectively, you could set up the situation to get people to choose one or the other quite easily.