What would you do if your elevator's doors opened to reveal one man choking the life out of the other?
That's what the minds behind Thinkmodo wanted to find out when they faked a murder in an elevator to see just how people would react.
'What would you do if you walked into a murder in progress?' asks the video's YouTube poster, BeatriceRevenge.
Scroll down for video
Ready: The pranksters have everything they need to convince people a murder is taking place
Surprise: When people open the elevator this is the shocking scene they're greeted with
'Two guys asked themselves the same question and staged a murder in progress inside an elevator. Hidden cameras recorded people's reactions. What would you do?'
It's a classic fight-or-flight test.
Some people immediately jump into the fray and try to save the man being strangled. Others just walk away.
Help: This woman tries to pull the victim to safety
Stop it: Yet another tries beating the assailant with her bouquet
Put it out: One man tries to cool things off with a fire extinguisher
Some seem too shocked to move. And one one sees it as the perfect photo op.
Besides being a great, living Rorschach test, the video is a publicity stunt for the upcoming film 'Dead Man Down,' an upcoming gangland thriller.