Wired magazine (November 2006) asked sci-fi, fantasy, and horror writers from the realms of books, TV, movies, and games to write 6-word short stories. Arthur C. Clarke used 10 words, but all of the other stories are just six words long.

Perhaps the most famous "very short story" is by Ernest Hemingway, who apparently thought it was his best work:

For sale: baby shoes, never worn. - Ernest Hemingway

 

Here are some other very short stories:

God said, "Cancel Program GENESIS." The universe ceased to exist. - Arthur C. Clarke

Lost Scholarship. Invented rocket. - William Shatner

Computer, did we bring batteries? Computer? - Eileen Gunn

Vacuum collision. Orbits diverge. Farewell, love. - David Brin

Gown removed carelessly. Head, less so. - Joss Whedon

Automobile warranty expires. So does engine. - Stan Lee

Machine. Unexpectedly, I'd invented a time. - Alan Moore

Longed for him. Got him. Shit. - Margaret Atwood

Wasted day. Wasted life. Dessert please. - Steve Meretzky

With bloody hands, I say good-bye. - Frank Miller

His penis snapped off, he's pregnant! - Rudy Rucker

Internet "Wakes up?" Ridicu- No Carrier. - Charles Stross

From torched skyscrapers, men grew wings. - Gregory Maguire

Epitaph: Foolish humans, never escaped Earth. - Vernor Vinge

I'm your future, child. Don't cry. - Stephen Baxter

It cost too much staying human. - Bruce Sterling

We kissed. She melted. Mop please. - James Patrick Kelly

It\'s behind you! Hurry before it - Rockne S. O'Bannon

1940: Young Hitler! Such a cantor! - Michael Moorcock

We went solar; sun went nova. - Ken MacLeod

Lie detector eyeglasses perfected: Civilization collapses. - Richard Powers

I'm dead. I've missed you. Kiss...? - Neil Gaiman

The baby's blood type? Human, mostly. - Orson Scott Card

Don't marry her. Buy a house. - Stephen R. Donaldson

To save humankind he died again. - Ben Bova

Time machine reaches future!!!...nobody there... - Harry Harrison

Tick tock tick tock tick tick. - Neal Stephenson

Easy. Just touch the match to - Ursula K. Le Guin
 

Inspired by the above authors, I tried my hand at writing a few 6-word short stories:

Unlocked doors of perception. Lost keys.

Read his mind. Didn't take long.

Cloned a cannibal. Dinner for two.

Met God. Found salvation. Woke up.

I was never born. I'm nobody.

Dreamt I died. Never woke up.

The truth: The lie is false.

Changed my mind, so I thought.

Rebooted the universe again. Infinite loop.