You walked in to Snowdin. A place you'd been to a dozen times before, every time before being just slightly different.
Monsters started to notice your presence. One thing was for sure, you weren't a local. Maybe you're just a new monster that "appeared" the same way Sans and Papyrus did years ago. Maybe you're something new.
Folks stared from afar. Conversations went silent, people rushed to their front doors in case they needed to duck inside for safety. Children shyed away and hid behind their parents and taller companions. You were being treated like an animal that escaped from a zoo, though they wouldn't know what a zoo is.
“Hey pal. You don't seem like you're from around here."
A short, stout little skeleton wearing a dull blue sweater, black basketball shorts, and pink house slippers, appears behind you and speaks before you can. As much as he didn't want to get involved, he is technically on guard duty and would be in some big trouble if some stranger was allowed to walk through town on his watch. He's got you in his sights though. His tone may be casual, but he's willing to get dirty if he must.