Searching the Internet for downloadable content is pretty easy since there are a lot of people out there hosting "files" for their personal use. What they don't know/don't care about is that google is indexing their public apache or nginx webroot.
We can easily search for the public index of peoples unprotected web servers running on their computers in their homes, and modify the search to look for specific filenames.
-inurl:(htm|html|php) intitle:"index of" + "last modified" + "parent directory" + (mov|mp4) + "game of thrones"
Replacing "game of thrones" with whatever you are looking for