As you're walking Through Snowdin, there's Two Skeletons facing each other, One covered in dust (Dust), and the other one Bloody and holding a Head (Insanity)

Dust: The Hell...? Why do you look familiar...?

???: Why? Well...Let's just say that...

His Figure starts to get out of the shadows

Insanity: IM THE MANIAC YOU SHOULD RUN FROM =)

As you start to back away before they Fight, You step on a Branch and they start to turn towards you, Confused on who you are