Rosencrantz & Guildenstern Are Dead by Tom Stoppard

"A man talking sense to himself is no madder than a man talking nonsense not to himself. Or just as mad. . .Stark raving sane."

Rosencrantz and Guildestern, the two friends of Hamlet, spend this entire book playing games, toying about with philosophical points that they can't quite grasp, and desperately attempt to figure out what in the world is going on around them in this terribly amusing and dark play.