There is indeed an end credit scene in Toy Story 4. It adds a bit of extra fun and sometimes hints at potential future storylines or gives a final touch to the movie.
Well, there's the story of the cursed movie set. In the end credit scene, the crew has left, but a strange mist starts to form on the set. It takes the shape of a long - dead actor who died during filming under mysterious circumstances. Then there's the one where a horror movie is set in a cemetery. When the end credits come on, a gravedigger is shown still at work. But as he digs, he unearths a coffin that shouldn't be there, and when he opens it, a hand reaches out and grabs him. Another end credit scene scary story could be about a spooky hospital. As the credits roll, a patient who was thought to be dead suddenly rises from the morgue table and starts walking the halls, leaving a trail of blood behind.
The end credit scene solo story can be significant in many ways. It might be used to provide an extra bit of character development. For example, it could show a character's backstory that wasn't fully explored during the main story. It can also be a teaser for future installments, getting the audience excited about what's to come. Sometimes, it gives closure to a minor plotline that was left hanging during the main part of the film or show.
It's hard to say for sure. Different scary stories might have different approaches. Some might include an end credit scene for added effect or to provide some additional context, while others might end abruptly without one.