Yes, there was. The post-credits scene in Scary Stories provided a hint or teaser for a potential sequel or added some additional context to the story.
One post - credits scene scary story could be about a haunted house. After the credits roll, a character goes back to the seemingly empty old house. As they enter, they hear strange whispers and see shadowy figures moving in the corners. Then, a cold hand grabs their ankle from under the bed.
They're popular because they add an extra layer of thrill. Audiences are already in the mood for something exciting after watching a movie, and a post - credits scary story catches them off - guard. It's like a little bonus that keeps the horror going.
Well, the end of Iron Man in the comics is complex. Sometimes it involves him retiring and passing the mantle to someone else. Other times, it's a climatic showdown with a powerful villain that determines his fate.