In all seriousness - check out Don Quixote. I'm reading it at the moment, and I'll just say there's a reason Salman Rushdie called it the greatest novel ever written at one stage. It's thicker than a paving slab - I'm not expecting to finish it this year! - but every word in it is gold. If you get the full version, you'll also get Tobias Smollett(the original translator)'s "Life of Cervantes" at the front, which is fascinating; and the Modern Library Classics version has a really good introduction by Carlos Fuentes.

And if you like or are interested in fantasy, have a look at Robert Jordan's The Wheel of Time series. It's cheesy in parts, but it's damn well-written and it's got a brain.