Sporcle

Sporcle: Mentally stimulating diversions

This website is so fun I just leave it up on my browser all the time. It features tons of different quizzes on a number of subjects: history, literature, geography, movies, sports, you name it. Each quiz has a time limit and you have that long to name as many members of the selected category as you can. It's stunningly simple and wildly entertaining. Go check it out. You'll thank me later...much later if you get as hooked on these quizzes as I do.