In reply to Siward: A Fine Balance - really? I'd have said it's one of the most horrifyingly depressing books I've ever read!
I second Spike Milligan's war memoirs
Off the top of my head and depending on your own taste:
Porterhouse Blue by Tom Sharp
Porno by Irvine Welsh
Pickwick Papers by Charles Dickens (honestly)
Vernon God Litttle by DBC Pierre
The Good Soldier Svejk by Jaroslav Hasek
Scoop by Evelyn Waugh
Atomised by Michel Houellebecq
Under The Frog by Tibor Fischer
.....have all made me laugh out loud a lot