Lethal Weapon by Shane Black.
As I was told at my first WGA meeting, the best thing about being a writer is no one needs to give you permission to do your job. You don’t have to be hired like a director, you don’t have to be cast like an actor. You write, and if it’s any good, things happen. Not always the way you want, not always when you want, but it all starts with you having an idea and making the decision to get to work.