These are some of the best short stories that I've ever read. I think that you'll enjoy them too. Please note that gut's is extreme, to say the least; it's not really enjoyed so much as survived.
- Guts by Chuck Palahniuk This a visceral piece of a writing, only those with a strong stomach should dare enter.
- Incarnations of Burned Children by David Foster Wallace Another painful story.
- Look at the Birdie by Kurt Vonnegut Delightful
- The Last Question by Isaac Asimov