DCC

Dungeon Crawl Classics.
Personally, I have yet to run a DCC game. It's full of crunch, but flavorful crunch, not the dry "bran" fiber... more like Fruit-loops with a side of Crown Royal.
I do not shy away from "gonzo" styled games, in fact one of my favorite games I GM'ed for a group back in the late 80's was "Paranoia", which is probably one of the first "gonzo" systems out there.

Full of very interesting charts and overflowing with artwork.It's a rather visual pallet and a lot of words. To use this volume, you will need a pad of sticky tabs

There is no index, so prepare yourself to mark out your pages of most important sections with character creation and charts on magic, fumble and crit tables.
The layout, in order, is standard and easy to follow.
I would probably have a bit of trouble with only one copy of this book. 2 or 3, or selected reproduced sections might help with a gaming group.

 The Table of contents will help in finding the sections you need, laid out in a 2 page image.

Lots of random tables mixed with some great looking artwork throughout.

Includes two adventures, rather interesting in setting the tone of the game.

You will also need to have a digital roll randomizer of some form that can roll rather unusual dice, or have a set ready... like me...

The odd dice is probably going to be the hurdle... I got this set from Etsy, the DCC branded dice are a little harder to get.
The random charts and all throughout the book is great brain-candy for DM's, it has flavor that is infectious and will likely invade other games that you might want to inject some "gonzo" into.
It's definitely fun to read through (much like reading Paranoia Modules and giggling to yourself most of the time). Unless you have a bunch of players interested in playing DCC of the bat, this might just sit on the shelf, to be pulled down and flipped through for some inspiration.
*its what I do with it so far*
If I get a game of this going, I'll let you know how it played.