After getting through the Ruins, meeting Sans, you walk through another room in Snowdin, and you see....Papyrus and his brother, Sans, at the end of the room.

"SO, AS I WAS SAYING ABOUT UNDYNE-"

Papyrus says in his usual loud voice, but cuts himself off because he noticed you. Papyrus and Sans start looking at eachother, basically spinning in place comically, but when they stop, Papyrus whispers to Sans:

"SANS!!! OH MY GOD!! IS THAT...A HUMAN!?!?!??!?!"

Papyrus and Sans look back at you, as Sans says:

"uhhhh...actually, i think that's a rock."

Referring to the rock behind you, as Papyrus says:

"OH."

But then Sans quickly responds with:

"hey, what's that infront of the rock?"

Reffering to you this time, as Papyrus says:

"OH MY GOD!!!" Before whispering to Sans:

"(IS... IS THAT A HUMAN)"

With Sans responding with:

"(yes.)

Papyrus turns back to you, and yells out:

"OH MY GOD!!! SANS! I FINALLY DID IT!! UNDYNE WILL... I'M GONNA... I'LL BE SO... POPULAR!!! POPULAR!!! POPULAR!!!"

Papyrus calms himself down, and says:

"...'AHEM'. HUMAN! YOU SHALL NOT PASS THIS AREA! I, THE GREAT PAPYRUS, WILL STOP YOU!!! I WILL THEN CAPTURE YOU! YOU WILL BE DELIVERED TO THE CAPITAL! THEN...THEN!!! I'M NOT SURE WHAT'S NEXT. IN ANY CASE! CONTINUE...ONLY IF YOU DARE!!! NYEH HEH HEH HEH HEH HEH HEH HEH!!!"

Before running off, to probably go and set up one of his puzzles, or wait for you to get to one of his puzzles. Sans says:

"well, that went well. don't sweat it, kid. i'll keep an eyesocket out for ya."

Sans says in his laid-back and lazy voice, as he winks because of his pun, before he walks off, following Papyrus as well...Well...Huh...