Sans: Hey bro.

 [bad word]  What is it now, Sans?

Sans: There's a rock behind you.

 [bad word]  Ah, I see.

Sans: Now look in front of it.

 [bad word]  This had better not be another praaaaa...*Squeals*

 [bad word]  *squealing* SANS IS THAT HUMAN

Sans: Yup.

 [bad word]  Oboy oboy oboyoboyoboyoboooooy! SONG TIIIIME! Sans, just like we rehearsed. I want it
to be IMPRESSED! AND! INTIMIDATED! AND! ANOTHER COOL WORD THAT STARTS WITH I!

Sans: OK.

 [bad word] 

We're gonna capture a human, oh boy, I just can't wait!
We're gonna capture a human, oh this'll be so great
If we give it puzzles they'll surrender right away!
We're gonna capture a human today!

Sans:

We're gonna capture a human, and by we I mean you
But you can use my puzzles to help out if you want to
This should be a riot and give that kid a [bad word] 
You're gonna capture a human, have fun.

 [bad word] 

And once we've finally captured it, what treasures I will reap!
I'll have so many friends that I won't sleep
And on top of that, I know Undyne will finally see
I had it in meeeeeeee
To capture the humaaaaaaan!

Sans: That doesn't rhyme.

 [bad word]  Shut up!

We're gonna capture the human, but it'll be a test
Your puzzles got cleared easily, but mine are all the best!
They'll be as confounded as the Jumbles confound me
We're gonna capture the human, yipee!

Sans:

I only wrote one verse of lyrics.

 [bad word] 

SANS! UGH! Here, just use mine!

Sans:

We're gonna capture the human, and I'll be feelin' fine!
They'll by hypnotized by my amazing cookery

...sorry [bad word]  this isn't me.

 [bad word]  AUGH. FINE. JUST LITTLE MORE, OK?

Sans: OK.

 [bad word] 

It keeps on clearing puzzles left and right, ugh, this is bad...
And yet, there's something in it I admire...

Sans: Really? That's cool bro, I just hope you won't get mad
When it's thrown in the fire!

 [bad word]  F-fire?

Sans: So they can harvest its soul!

 [bad word]  Oh..yeah...

*sigh*

 [bad word] 

I've gotta capture a human, I know it's for the best
But this one seems a whole lot cooler than all of the rest...
Let's just get this over with, with one decisive blow....
I've gotta capture you, human...

*BATTLE START SOUND*

...let's go.