The first time I came across the expression Dead Pool was with the Clint Eastwood movie The Dead Pool. In the movie, a lunatic has created a dead pool, a list of people he expects to die. Of course, in this case, the lunatic is conveniently killing the people on his list. But a true dead pool is very much like any other kind of pool, like hockey and football pools. Except that you pick people you think will die, rather than attempt to guess a score or a season winner.
The Rotten Dead Pool website is a fantastic resource and allows you to pick ten people you believe will die during the year. The game resets every year, and registered users have their scores kept and displayed throughout the year. The site also provides a pretty extensive database of past and present celebrities, along with any relevant information. Some basic rules about the game are also provided, and please keep in mind that any interference on the part of the player that might concern one of their picks renders the pick invalid. No, you can't kill the people on your list! Where's the fun in that?
My best score so far has been 5 out of my list of 10. I know, it's morbid, but it invokes some pretty deep thinking if you make your picks seriously. Go take a look right now and make some picks, see how you score this year!