This video shows that, when you work in a laboratory, inoffensive office pranks can turn into brutal weapons of selective destruction and contusion. Like this insane pneumatic cannon.
This is how they say they did it:
These guys - including the victim - have been breathing weird gases for too long. Or maybe the whole thing is a prank on us, and this is a very clever CGI. Either way, I bow to their ingenuity and skill and their weird gas inhalation powers.