Person, by Sam Pink, is the essential bizarro novel. Pink doesn't need anything weird--his bizarro is the absurdity of everyday life.
He dispenses with plot, content to follow around a man who lives an unremarkable life.
Everything about this novel rings true to me. Pink, in lyrical fashion, illustrates how Person thinks--flitting from one subject to another based on shallow emotional reactions, always afraid, always questioning--and this is the core strength of this book.
Fill the Grand Canyon and Live Forever by Andersen Prunty. I'd read Prunty's short horror stories and thoroughly enjoyed them, but this, for me, was a cut above.
Our narrator spends a lot of time working on his MyFace page, gaining followers for his group that supports a TV personality who encourages people to, you guessed it, fill the Grand Canyon so that they can be immortal.
This book is hilarious. It's populated with weird and insane characters who embark on murderous rampages, ecstatic tooth-brushing, macabre cheerleading, and desperate attempts to make any sense out of anything.
If you want a real treat, check out Prunty doing a reading from the book here. I love the frenetic pace of this. Every reading should be this charged.