5. Taking Advantage of Post-Credits Scenes
Little bonus scenes at the end of films had certainly been around before this, but Marvel Studios elevated them into an art form all their own. Starting with the end of Iron Man, where Nick Fury shows up to introduce Tony Stark to the "Avengers Initiative," fans have eagerly stuck around until the lights come up for those little teasers that point the way to the next big chapter in the Marvel saga. And they're rarely disappointed.