Get a grip on your fear of gems with our exclusive clip from the upcoming fourth episode of “Fear Factor: House of Fear.”

As host Johnny Knoxville explains, “Everyone in this challenge will get their very own garbage chute to stand under. Sliding out of these will be bin juice, a liquid cocktail of things that once squawked, squealed, and now stink.”

He continues, “Along with it, a terrible object will fall out that you have to catch: sheep heads, cow feet, and even a full-on carcass. If you catch...