Tiny Heavyweights: Or, 'A Steady Decadent Diet of Short Attention Spam'

Most short story collections are great introductory sampler packs of an author's style.  Others offer experiments and bite-size scenarios to keep the fans sated between novels.  But every now and then I read a short story that's built so perfectly, so standalone and compact that i want to share it with the world.  And for an author to pull that off repeatedly in a collection?  Don't get me started!  Okay, do: here are some examples of the unique art of cramming 300 pages of ideas into 5-20.