Whenever I use Google images to search for a particular kind of picture I usually get some pictures associated with the keyword, but then I will get one or two that have nothing to do with what I am searching for.
This link takes that dilemna and turns it into a game. A pretty addictive game at that. Basically you will be given a page and on the page there will be 20 pictures from an image search and your job is to guess the keyword that was used. There are 10 stages and you have 20 seconds to guess the correct answer for each stage. Have fun playing. Google Game.