Ross Thompson is the name of the guy who created these amazing trailer mashups, this movie review has come up with some of the most awesome videos from the most popular blockbuster to the classics like "Pulp Fiction".
Here is some of his work:
Harry Potter (Scott Pilgrim Style!)
Star Wars (Guardians of the Galaxy Style!)
Monsters, Inc. (Prometheus Style!)
Toy Story (Man of Steel Style!)
you can check more of his work on his youtube page