"Officials said that water pistols would do just as well as karate."
Isn't that just the /best/ line? It just /begs/ for a backstory.
I took a fiction writing class once where the instructor had us carry around a batch of index cards with us all the time, so we could jot down interesting lines we overheard during our day.
Then each week, we would throw these cards into a hat and randomly pick one out as the basis for a story. It was incredibly fun and energizing. I once wrote a flash fiction piece based on the form of the Nutrition Information box found on foods and the line
"It fell between the crabs."
So, if you post me a flash piece with the water pistol line in it, along with your email, I'll backchan the /real/ story behind the line.