Since I studied syncing lips to audio in one of my graduate animation classes at Academy of Art University, I'm well aware that the actual movement of our jaws and lips when we speak reveals only a portion of the sounds we're making. Similar sounds often look alike. The mouth doesn't move separately for each letter. I'm simplifying, but it's really the art of studying how the mouth actually moves so that speech looks real.
What Bad Lip Reading does is, it takes those lip movements and adds wrong words that actually fit.
Here's what they did with Twilight:
Even better, they also take music videos and create completely new, different songs that fit with the videos. "Russian Unicorn" is based on the video for Michael Bublé's "Haven't Met You Yet." Not only is it hilarious, it's also an excellent pop tune.
If there's a point to this blog post, it's that I love this sort of totally out of the box creativity. And that "Russian Unicorn" is an awesome tune!