Supernatural in the Park by Hay1ock
LJ link (scroll down about halfway, it's called "Mentally Dull - South Park Megamix")
YouTube link
Vid by: Hay1ock
Fandom: Supernatural
What it’s about: I’m one of about 12 people from my generation who can’t stand South Park, but even I can see that crossing it with Supernatural is one of the freaking funniest things on the face of the planet.
Why it’s worth watching: Concept, song choice, lead in, characterization, once is not enough
Favourite bit: Sam tells us why everyone hates him, that first “Say something, Mr. Hanky!” screaming Jo, and just the idea of Dean as Cartman.