The music mogul is seen risking being shot by a crossbow, as he assists Ben Blaque with his unique act on the ITV talent show.
After Ben calls Simon to the stage to help him, he explains that there are six crossbows which are all set up to trigger each other, with the last one aimed at an apple placed above his own head.
Explaining how Simon will play a part in his stunt, Ben confirms he will be blindfolded, with Si ringing a bell in front of the first target, which Ben will have to hit from his sense of hearing alone.
"Simon's right in the way of that," Amanda screeches, as Simon begins to look increasingly worried.
It is the second time the judges have been left on the edge of their seats this series, following sword swallower Alexandr Magala's audition.
The performer diced with death as swallowed a sword and proceeded to perform a series of jaw-dropping stunts.
Watch a clip of Ben's audition above, and see it in full when 'Britain's Got Talent' airs tomorrow night at 8pm on ITV.