Donald Barthelme is not afraid to be stupid. If you're expecting to open this book, read it from start to finish, and for there to be recognizeable characters and epiphanies and 'human dilemmas' and other sorts of things you've come to expect from 'literary fiction', then you're going in with the wrong mindset. No, serious. It's not just nonlinearity. Sometimes Barthelme's writing is retarded. You can see it trying to be funny and failing, or just plain showing off, dropping names. But then, just as you're about to put the book aside, Barthelme will toss off some random, memorable line or image.
Let me give you an example, from the story "The Party" :