Plato and a platypus walk into a bar...

Dimitri: "If Atlas holds up the world, what holds up Atlas?"
Tasso: "Atlas stands on the back of a turtle."
"But what does the turtle stand on?"
"Another turtle."
"And what does that turtle stand on?"
"My dear Dimitri, it's turtles all the way down!"

You don't have to have much background on philosophy (I may be wrong here since I did take take a module on moral ethics in university) to enjoy this book, but having a sense of humour is a pre-requisite. I'd say it's an easy read - every section starts off with mind-boggling theories (makes you wonder if some humans do tend to think too much!) that stimulates the mind, and ends with jokes that cracks one up. Highly recommended if you are interested in a crash course in philosophy.