Next time you get a crazy movie idea, just remember the only person stopping you from making it is yourself. When Kevin Smith got the bold idea to shoot a comedy about two convenience store clerks, he sold off collectibles from his comic book stash, used insurance money, and maxed out 10 credit cards to make it happen. At a cost of $28,000, Clerks was still incredibly low budget, but grossed over $3 million and jump-started Smith's career as a top filmmaker.