Oh it's gotta be Discworld. Terry Pratchett is a certifiable genuis and with lines like these

"If complete and utter chaos was lightning, then he'd be the sort to stand on a hilltop in a thunderstorm wearing wet copper armour and shouting 'All gods are bastards"

and

"When You're Up to Your Ass in Alligators, Today Is the First Day of the Rest of Your Life"

AND

"Speak softly and employ a huge man with a crowbar."

I mean the man is amazing and Discworld is hilarious. PTerry for the win!

If you haven't yet read Discworld and would like to, here's a link to the best reading guide out there. You could just read them in publication order, but where's the fun in that?