Okay, I remember something about a creepy kid who's playing flippermachine in a bar, and his teacher sees him and takes him home. But his parents are looking in the teachers bag, when she's gone and the boys sister have no mouth and is sitting in front of a TV. And then the teacher takes the kid with her, and I can't remember more. I do remember it gave me the chills and some nightmare.. T.T
Something tells me its twilight zone- the movie, but is not sure..

It sounds like a segment of the Twilight Zone movie... the one directed by Joe Dante and starring Kathleen Quinlan, if I remember correctly. Remake of an original TV episode starring William Mumy.

Thank you! :)