Appearance in Pacifist / Neutral route:

*You were supposed to meet with Sans here but...

*There's just a pile of cardboard boxes sitting in the snow.

*Upon further inspection, it looks like a decoy Sans.

"*Oh, hey. Hehe, yeah. One off my favorite puns."

"*Papyrus said that he could catch some humans if he made a decoy."

"*But it was shelved for a while 'till you came around."

"*sometimes I like to prop him up somewhere and trick Papy into thinking it's me."

Appearance in Genocide route:

"*Heya, since it's never gonna be your turn..."

"*I was thinking I wanna go take a nap. So here, I'll leave this guy to watch you."

*Sans has placed a decoy in front of you.