Guess-the-Google

For a fun time-killer, you could do a lot worse. Grant Robinson's Guess-the-Google uses Google's image search to generate 20 images based on a single keyword. Your task is to guess the keyword in 20 seconds or less. Ten rounds, and if you're really quick and clever, you get to put your name on the high score list. Very cool.
(seen at IFTF's Future Now)