Boggle

From Amazon.com: Earn points by spotting words your friends don't before time runs out. Shake the grid to mix up the letter cubes. Then lift the lid and flip the timer. Players have 90 seconds to write down as many words as they can find on the grid before time is up. At the end of the round, score the words. If two or more players find the same word, that word doesn't count. The player with the highest score wins.