The Portal turrets Christmas carol is full of holiday cheer and neurotoxin

Carol of the Bells is an extremely catchy Christmas tune, in fact, it's almost too catchy. When Portal turrets sing it, it's just as catchy – even with the murderous intent.

The talented Harry 'Harry101UK' Callaghan and August 'Rantis' Loolam combined their efforts in Source Filmmaker to create an absolutely awesome holiday carol for the Portal Turrets to sing. Harry handled all of the music, voices, animation and editing, while August handled rigging the turrets.

I've listened to it about five times since finding it. I cannot escape the song. Here are the lyrics for those of you that want to sing along.

Time for some tests!
Shoot the subjects!

Make them all die! If they survive! Bake them a pie! The time is nigh! Testing is here! Let out a cheer!

Please sing along! This is our song! For the Animal King! We'll always sing!Guns we will bring! Bullets we will sling! Fill them with holes! That is our goal! Test if you dare! Are you still there? Please sing along! This is our song!

With joyful ring! We're caroling! Neurotoxin! Is pumping in! From everywhere! Filling the air! Filling the air! Filling the air!

Oh how they pound! Raising the sound! Throughout Aperture! GLaDOS is here!

Merry, merry, merry, merry science!
Merry, merry, merry, merry science!

Testing all year! With Christmas cheer! We'll only stop! When subjects drop!

[INTERMISSION]

With joyful ring! We're caroling! Neurotoxin! Is pumping in!

From everywhere! Filling the air! Filling the air! Filling the air! Oh how they pound! Raising the sound! Throughout Aperture! GLaDOS is here!
Merry, merry, merry, merry science!
Merry, merry, merry, merry science!

 Testing all year! With Christmas cheer! We'll only break! For tasty cake!
[TURRET SOLO]

That is our song!

[PC Gamer]