Okay I have things I should be seeing to but I couldn't help myself. In case you, like me, have not read all of these stories and would like to be amongst the lucky 10,000 today:
I Have No Mouth and I Must Scream by Harlan Ellison
The King in Yellow by Robert W Chambers*
The Lottery by Shirley Jackson**
The Masque of the Red Death by Edgar Allan Poe
The Monkey's Paw by W.W. Jacobs
The Most Dangerous Game by Richard O'Connell
The Nameless City by HP Lovecraft
The Ones Who Walk Away From Omelas by Ursula K LeGuin
There Will Come Soft Rains by Ray Bradbury
The Yellow Wallpaper by Charlotte Perkins Gilman
The Veldt by Ray Bradbury
Honorable Mention from the comments/reblogs:
All Summer in a Day by Ray Bradbury
*note: this is actually a collection of short stories and clocks in at about 72k words
**Originally published in the New Yorker in 1948; interestingly, the New Yorker still has this story archived on their website BEHIND A PAYWALL. CAN YOU IMAGINE.