Flash-fiction -- particularly the six-word story -- is fun and challenging. The most famous one is almost certainly improperly credited to Ernest Hemingway. The legend is that he won a bar bet from some writer-pals in the 1920s. However, versions of the tale date back to the early 1900s.
The story:
"For sale: baby shoes, never worn."
Interestingly, most people interpret it as something sad. A miscarriage, a tragic accident, a death of a parent, etc. But it could be that... oh, I don't know... a healthy baby was born with large feet.
Think positive,
Paige