All Marvel post-credit scenes have a purpose. Either to be funny, or to provide a teaser for the next movie (or for a movie in the distant future), or to tie up any of the movie’s remaining loose ends. Here are some of my favorites.
• The Avengers, Scene #2
I think the best thing about this scene is that the restaurant was still willing to serve food after aliens attacked New York and destroyed everything. Also, Thor needs to take smaller bites.
• Iron Man 3
After Iron Man defeats the bad guy and fixes all the problems at the end of the movie, you learn that the whole time he was recounting these events to Bruce Banner, therapist style. And that Bruce fell asleep at, like, the very beginning of the story.