While this video was no doubt meant to be lighthearted, we can't help but postulate that this is exactly what it would sound like if Mario were to go on a real-life killing spree. And that, kids, is never funny. Except when it is.
This is actually really similar to how we turn the music off during most games and play the VVVVVV soundtrack instead. It makes survival horror games a lot more fun.
If you know of another video with Mario sounds incongruously dubbed over something inappropriate, let us know in the comments or on Twitter.