Hemingway once wrote a short story in just six words. Here it is:
"For sale: baby shoes, never worn."
Can you tell a story in six words? If your brain freezes up at the thought of that - can you describe your day in six words? Can you write your memoir in six words? Can you describe yourself in just six words (make me proud - only use positive words!).
If this becomes addictive to you, or you want some inspiration check out Smith magazine where they took Hemingway's idea and ran with it. It's a cool website. They also have a couple of amazing anthologies of six word stories.