WATCH: Halloween chainsaw prank on plumber goes MASSIVELY wrong
THIS is the moment an elaborate prank involving fake blood, a chainsaw and a Halloween mask goes shockingly wrong.
The chainsaw-wielding prankster terrified the plumber
Irishman James Slattery, a YouTube prankster, was behind the practical joke which ended in tears all round.
After hatching the plan, the devious flatmates decided to call a plumber out on an 'emergency'.
A secret camera in the bathroom records the handyman complaining about being asked to attend to fix a leaky tap and saying he would have to come back later.
He said: "This isn't actually an emergency now is it? I only get called out for emergencies. I was told there was a flood here and I was going to cope with that.
"I didn't know it was just a leaky tap. There's nothing I can do."
After saying he will return tomorrow, one of the flatmates prepares for the joke.
He dons a mask in a room next door, before firing up a chainsaw.
The female flatmate then rushes into the bathroom screaming and covered in fake blood.
***WARNING: The video below contains explicit language***
Mr Slattery lies in the bath pretending to cower before the man with the chainsaw turns it off, removes his mask and reveals it was all "just a joke mate - it was a prank".
But the stunned plumber was far from impressed and the scene descends into utter chaos.
The plumber was asked to fix a leaky tap - but wasn't happy
The prankster preparing for the 'joke'
The masked man reveals himself - but then the craziness happened
In his YouTube profile, which has nearly 2,000 subscribers, Mr Slattery said: "I am truly sorry for embarrassing anybody that was doing their job.
"I love and respect all of you and I am going to use that to my advantage all in the name of comedy."