In most cases, no. American fiction is focused on the main narrative and doesn't commonly incorporate post-credit scenes. However, there might be some rare exceptions in experimental or unconventional works.
A post - credit scene scary story might involve a cursed object. In the main movie, the object seems harmless, but in the post - credit, it starts to glow and strange noises come from it. It then causes chaos in the empty theater where it was left. Also, there could be a post - credit scene where a character finds a diary that tells of a horrible past. As they read it, shadowy figures start to appear around them, and the words in the diary start to bleed, creating a truly terrifying moment.
It can be quite important. It might set up future plotlines or introduce new characters. For instance, it could be the start of a new arc for a character like Qi'ra.
Maybe we could see the return of a minor character from the movie, like that one smuggler who helped Han Solo briefly. It would be a cool little teaser for a potential sequel or spin - off.
One post - credit scary story could be about a haunted movie theater. After the credits roll, a lone janitor is left in the empty theater. Suddenly, he hears whispers that seem to be coming from the seats. As he looks around, he sees shadowy figures moving in the aisles. Another is a story of a cursed DVD. Once the movie ends and the credits are over, anyone who touches the DVD starts to experience strange visions of a malevolent spirit.
They enhance it by providing an unexpected twist. Just when the audience thinks the horror is over, the post - credit scene hits them with more fear. It makes the whole horror experience linger in their minds longer.