Remember the Pepsi Challenge?

According to the book I'm reading, lots of people can tell Coke from Pepsi if they take a sip from two cups. But, interestingly, very few can succeed if you change the game slightly:

• Get three glasses.
• Put Pepsi in one.
• Pour Coke in the two others.
  
• Tell someone to taste them all and pick out the one that's different.

Most people can't do better than get it right a third of the time--which they would do from random chance. The truth is, most of us have a very hard time remembering flavors and comparing them to other flavors.

This book is full of interesting crap like that. And some of it is very useful. It's Malcolm Gladwell's Blink.