The importance of editing and music choice in films is obviously important, as shown in '500 Days of Summer: the Thriller'.
This hilarious short fake trailer is quite believable as a thriller. If you haven't seen the original film, you would honestly think this was real. The combination of the perfectly chosen and cut scenes with the dark and spooky music more than meets every requirement for a good thriller. Check out the '500 Days of Summer: the Thriller' for a quick laugh!