By now it's been done so often that it almost seems there's a law demanding it: Superhero movies aren't complete any more unless, after the credits, they feature one last scene that adds a twist to the story, hints at the next sequel or both.
When cracked asked their photoplasters to think of some typical scenes for this contest I suggested these two - with Spiderman making the article:
When Cracked wondered what'd happen If famous pictures were turned into Propaganda posters of course I had some suggestions of my own...
Like James Bond selling warbonds:
Chairman Mao and his Red Rangers: