In a word:
Synopsis (from http://www.movieweb.com)
When a freak hurricane swamps Los Angeles, thousands of sharks terrorize the waterlogged populace. And when the high-speed winds form tornadoes in the desert, nature’s deadliest killer rules water, land, and air.
Okay, stop right there! I dare you to not think at this very second that your story is WAY! better than this ridiculous one. Go ahead. You can’t! This has got to be the dumbest storyline ever invented by man.
It was made into a movie. It was released on July 11th, 2013. Many people invested large quantities of time and money because they believed it would be successful. For real.
If you have a story idea and you feel stuck, think SHARKNADO! and an immense feeling of determination will flood you. Finish your book. Write out every horrible, beautiful word flowing inside you. Get to the end before you begin judging the quality of the story.
if SHARKNADO made it, you sure as hell better believe your book can make it too. The difference? Someone completed this story and yours is still a work-in-progress.
To see the trailer: http://www.movieweb.com/movie/sharknado/trailer