I dont even like reading but i fn loved "in fifty years well all be chicks" by adam corolla read that shit in a couple days. Guranteed laugh on every page.
Have you ever read "The World According to Garp" by John Irving,River? That's a funny one.He's quite a popular writer so you should find him in most good bookshops.
"A Walk in the Woods" by Bill Bryson - I LOL'D at least once per chapter, and there's an important message to be gotten from it.
JD Salinger's "The Catcher In The Rye" is always worth a re-read,although I would describe it as tragi-comic. (And no...I am not a homicidal maniac.)...You'll know...If you know...