Performing an autopsy on a dead Creeper just seems like a bad idea.
The green guys who always seem to get into your perfectly crafted compound or hide around corners in deep shafts in Minecraft are an enigma. Where do creepers come from? Why are they green? Why do they emit that terrible "SSSSSS" sound right before they blow up? Well, thanks to a claymation video by YouTube user "leehardcastle" depicting a super top-secret government autopsy of a deceased but as yet un-exploded creeper, we might know the answer to that last question.
Be warned, the following video is not for the faint of heart and contains some harsh language.
Dr. Russ is an affable chap, but he discovers not only why creepers blow up, but that the hissing sound comes from a burning fuse leading to a bundle of dynamite. That's why a dead creeper is the best source for gunpowder in Minecraft.
Now, why they sometimes drop music discs is anybody's guess. Perhaps another autopsy is in order.