I'd recommend you look up "Desert Bus" on wikipedia or some other source you feel comfortable with. While I don't completely agree with Penn and Teller, they do have a point. The most interesting thing happening in the game is when a bug is squashed on the windshield after 5 hours and 33 minutes (iirc).
I watched the show last year, and it was a lot of fun. The game is not really the point, it just gives them something to focus things around and hilarity ensues every time they crash the bus. Did you know that Paul had a full beard about one year ago? Yeah, he shaved it off for quite a bit of a donation. Also, remember this:
Remember - Child's Play is a registered charity, so if you live in the United States, your donations are tax deductible. You can get a tax receipt by contacting Child's Play.
Myself, I will have "Desert Bus for hope" as one of my tabs for the next 6(?) days.