Two seconds before terror.

There's probably some kind of a point I could make about how we all walk through our lives in the "happy masks" we use to hide the monsters that people only get to see once they get close to us. I'm sure I could probably come up with something like that. But I think I'd rather just say that if I found myself the victim of a prank like this, I'd immediately expel about five different kinds of bodily fluids before falling catatonic to the street:

Sources: Ed Bassmaster | h/t io9