"As for what it takes to pop a human? It happened once. Took a sudden and abrupt pressure drop of 8 atmospheres. Bits and pieces of the poor fellow were found hanging from stuff 50 meters up. He and his buddies were decompressing after a deep sea dive on an oil rig. He was near the door in a room with 8 atmospheres with pressure. Someone did the wrong thing and decompressed the whole chamber. Check "Uncontrolled decompression" on the wikipedia."
Except for the fact that is completely and utterly wrong, what you have just described is what happens when an explosive goes off by someone.
The guy didn't pop he got crushed and ripped apart by the force of the air rushing out of the chamber.