The Starbucks Challenge:
You may need to dip into your life savings account for this one and possibly line up a bunch of friends to drink the leftovers, but the concept is fun! Similar to the Pringles Challenge, you and a friend purchase a bunch of different coffees from Starbucks (or have a third party do it so that you do not know the flavors ahead of time), blindfold yourselves, and then try to guess the flavors you taste.
Example here:
(video here)
Click here for a collection of more fun YouTube Tags!
Have fun!