Amanda Holden ran away screaming when the spooky Witches brought out a live rat.
The mysterious performer in Monday's semi-final asked the judges what scared them.
‘I can invoke your deepest, darkest fear,' they began.
Simon Cowell, David Walliams, Alesha Dixon, and Amanda had to reach into a box and pick up what was inside.
The visibly terrified Amanda pulled out a piece of paper that had the word 'rodents' in bold.
Amanda yelled: 'Is there a rat in here?' Alesha obeyed immediately.
After the lid was lifted, Amanda and Alesha saw a rat on the panel and ran.
Only David and Simon could deliver their feedback, while Alesha and Amanda stayed away.
Amanda told hosts Ant and Dec it was one of the most terrifying things she'd ever experienced in 16 years.
The Golden Buzzer act delivered an energetic performance, but David joked that if fans don't vote, he may quit.
As he closed the show, Sheffield busker Maxwell Thorpe received another standing ovation.
ITV returns Britain's Got Talent on Tuesday at 8pm.
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