After seeing this article on six word short stories, a friend and I exchanged some of our own. 
Here are mine:


Sci Fi:
Almost to infinity…divide by zero. 
Bionic arm commits murder. Who's responsible?
New body. Download brain. Eternal life!
Here to Pluto. Five minutes flat.
Working on moon. Commute still sucks.
Is it hot? Greenhouse effect realized.


Horror:
Ax murder. Whodunnit? Not the butler.
Zombies! Gore! Blood! Chainsaws! Surprise ending.
Is that bloody arm crawling? Yes.
Where did everyone go? What smells?