This Tool/Taylor Swift Mashup Oddly Works
It's Stinkfist... but it's also Taylor Swift... and it's weirdly good. Such an odd pairing for the internet, but if something works, it works.
This isn't the first or even greatest mashup of all time, but it might be the greatest crossover I've found online. You really can't pick two polar opposites of the music spectrum can you? One is meaningful and poetry incarnate, the other is pop music written to make millions of dollars. Hit play, give it a listen, laugh at how odd and stupid it is, then spend the rest of the day getting it out of your head.
Don't forget to song-bomb your bros with it.