We've funded everything from coffee ships to flying cars.  Companies that fit one of these categories often raise money successfully:

• Do you have a strong community of friends, supporters, fans, or customers? Most companies bring in ~50% of their investors. 
• Are you doing something really cool that no one has ever done before? Investors get excited about being part of something ambitious.
• Does your product directly improve people's lives? People like to invest in things that do good in the world. 
• Do you have at least one investor investing on the same terms?  
• Do you have some traction?  Investors like proof you can execute.