The group yesterday (July 1) were called into the small task room one by one to face a hideous trial, however only the ex-Playboy bunny was under the impression that this was genuine.
The rest of the housemates were secretly informed by Big Brother that waiting in the room was a special effects team, who would make them look as though they'd just faced something terrifying.
The housemates' objective was to give such a harrowing account of their ordeal once they returned to the house that Shievonne would refuse to take part in her 'trial'.
If the 28-year-old chose to face her fears and enter the task room, then she would receive a personal treat but the group as a whole would fail. However, if Shievonne is convinced by her fellow housemates' acting and refuses, then they would all be rewarded.
After watching a soot-covered Arron Lowe collapse upon his exit from the Dairy Room, Scott Mason emerge covered in mud and stinging nettles, Becky Hannon step out tangled in a giant fishing net with sea creatures and other shocking scenes, Shievonne became convinced that she would have to face her fear of clowns in the room and - with a little coaxing from her housemates - decided not to enter, winning a gourmet meal for everyone.
The full task can be seen on tonight's Big Brother at 9pm on Channel 5.