Watch the moment Big Brother’s Sarah launches into sweary rant as she’s ELECTROCUTED in task

BIG Brother star Sarah is left furious in tonight’s episode as she is electrocuted as part of a task.

The famous house is transformed into the R.A.T. Laboratory for this week’s shopping task – and it’s not long until some of the housemates are unhappy.

Big Brother tells them: “Good morning and welcome to the Rodent Assessment Testing Lab… this state-of-the-art laboratory carries out groundbreaking research into rodent behaviour on its long-tailed test subjects.

 “However, the lab's future funding hangs in the balance and will be decided by today’s important experiments. If the research is completed successfully, the lab will receive luxury funding and will be the envy of the scientific community. Thank you for watching.”

Ali and Dean are given the role of professors while Hanah and Lily are lab interns.

Their job is to conduct experiments on the lab rats (the rest of the Housemates) in order to understand rat behaviour.

The fate of the luxury shopping budget hangs in their hands, as they must correctly predict most of the results of the experiments in order to pass the task.

A sneak peek at tonight’s episode sees Lily predict that Sarah might not react well, saying she is “extremely volatile”.

Sarah is then seen screaming in agony as she keeps getting electrocuted and she shouts: “Why are you pressing it all the f******g time.”

She continues shouting and chucking stuff around as the experiment went on.

The housemates are currently starving after being punished for breaking the rules by discussing nominations.

Plain porridge made with water, once served to orphans in Victorian slums, became their only meal option.

Hanah threatened to go on a hunger strike in the Diary Room.

She said: "Big Brother I can't do porridge. Plain porridge. That's famine.”

When Big Brother refused her some honey to sweeten it, she said: "I'm just letting this be known. I will end up starving myself. I will starve myself."