Plato and a Platypus Walk into a Bar . . .

This is by far one of the funniest books I have read in a long time. I was laughing out loud at some of the metaphysical jokes (this isn't one of them):

The optimist says, "The glass is half full."
The pessimist says, "The glass is half empty."
The rationalist says, "The glass is twice as big as it needs to be."