Books that made you laugh out loud.

[Bv3]

A Confederacy of Dunces

[RunDownHouse]

Confederacy of Dunces (John Kennedy O'Toole) is a good suggestion. Anything by Nick Hornby as well, with the exception of Fever Pitch.

[SoftcoreRevolt]

The Great Shark Hunt is easily the funniest thing ever written. (The piece, although some of the Nixon articles in the book are really funny as well.)

[Kuanti]

Don Quixote by Miguel de Cervantes

Cervantes describes Quixote’s growing obsession with knight-errantry, saying, “he so immersed himself in those romances that he spent whole days and nights over his books; and thus with little sleeping and much reading his brains dried up to such a degree that he lost the use of his reason” (Book 1, Part 1).

[shayneon]

Home Land by Sam Lipsyte has some great lines.

[revots33]

I highly recommend A Supposedly Fun Thing I'll Never Do Again, by David Foster Wallace. The title essay alone is worth the price of the book. Hysterical, and the guy's a great writer to boot.

[Al P]

Theory Of Poker.

That David S. is one crazy cracker.

[Wyers]

Vonnegut. Cat's Cradle and Hocus Pocus specifically.

EDIT: also Survivor by Chuck Palahniuk. For a small sample check out his short story "Guts" (linked below) - not for the squeemish (but definitely funny... sort of).

He also wrote Fight Club.

GUTS

[BruinEric]

Off the top of my head...

Eat the Rich and Parliament of Whores by PJ O'Rourke.

Little Green Men by Christopher Buckley

[callydrias]

Anything by David Sedaris