(I'm sorry if some of these answers sound stupid today, I stayed up pretty late last night playing through the Genocide run XD Ironic, I know...)

SniperHunter: Hey Pap! Ya wanna learn how to play Megalovania on the piano with me?

__________________________________________________________________________

Wait a minute!! You know that song too!?

My brother constantly walks around humming it all the time like it's the best song he's ever heard!

Er-
Anyways...

Undyne tried to teach me how to play the piano once!
She thought I did well, so I tired to play for Sans once....

...He ignored me...

Sans: But bro-...

It's alright Sans, I know I must have been horrible...

Sans: No I-

It's okay, you can be honest...

Sans: I don't have any ears.... ;D

...

...

Well that explains it!!

No wonder Frisk is the only one who really listens, she has ears!! :D

...

*Ahem*

Human!!
The Great Papyrus will gladly learn to play Megalovania with you!!