You can't go wrong with a story that starts out with:

 "Recently, I got a sex change on a whim."

Check out the rest of the story, written by Jack Handey (of Deep Thoughts fame)here:

http://www.newyorker.com/archive/2003/09/01/030901sh_shouts

He has several other stories on The New Yorker site. You can find a complete list here:

http://www.newyorker.com/search/query?query=jack+handey&queryType=nonparsed&submitbtn.x=30&submitbtn.y=7

Enjoy!