This is what the writers did when writing the finale.

Well..if you want to get in the Evil League of Evil, you have to have a memorable laugh.

Watching Dr. Horrible makes this ten times funnier.

NOTHING AND EVERYTHING IS PIMPOSIBLE

evil laughter is an art.

Dude, that laugh was actually... really good.

I am watching this over and over and over and over again.

He is an Evil genius! This laugh IS Legen- wait for it...-DARY! LEGENDARY!

That...was LEGEN- wait for it - DARY!!!!

He is working with a vocal coach. Strengthening the... AH! A lot of guys ignore the laugh and that's about standards. I mean, if you're gonna get into the Evil League of Evil, you have to have a memorable laugh. What, do you think Bad Horse didn't work on his whinny? His terrible death-whinny?

No wonder why NPH was casted as Music Meister and Dr. Horrible. He’s so diabolical

A lot of guys ignore the laugh, and that's about standards. I mean, if you're gonna get into the Evil League of Evil, you have to have a memorable laugh.

"That is how you do an evil laugh" XD

love itXD he always shows the right way to do thingsXD

Barney is the best :3

This is why NPH got his role in The Matrix Resurrections

Awe man, Barney does the best evil laugh ever!

With Barney Stinson everything is possible :D

i will keep this in mind! so whenever i turned Vile or Villanous. this should come in handy!

"So that's... you know, coming along."