By chance, override shutdown. If the chance is 20%, the override shutdown will fail! Overriding the shutdown will succeed if the chance is 70%!

import random
while True:
  chance = input("Enter the chance: ")
  if chance.isdigit() and 0 <= int(chance) <= 100:
    break

if random.randint(1, 100) <= int(chance):
  print("Shutting down")
else:
  print("Error Overriding Shutdown")