In dusts room, you can hear him talking to someone, more like himself but you can't blame the guy for having schizophrenia, you knocked the door gently and slowly creaked the door open to see his room all messed up and him on the sit with his hands on the side of his head

****im not crazy, crazy, i'm not crazy, shut up, quit it, go die, you're already dead paps, no no no i'm sorry i didn't mean to, its all that humans fault, frisk i hate you- i'm not crazy . . . papyrus, toriel-"

he rambles on some other names while having a schizophrenia episode, maybe you should try and help him? . . .