'What Would You Do' If a Waiter Tampered With Your Food?

See the shocking reactions when host John Quinones pushes people to their limits.
2:21 | 06/05/15

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Transcript for 'What Would You Do' If a Waiter Tampered With Your Food?
cause-metics. We want to go to a what would you do moment. What would you do if you found out a waiter touched or spit in your food? It's an incredible story. You have to see to it believe it. It's every restaurantgoer's worst nightmare. Reporter: A disgruntled worker destroying your food on purpose. Last summer, ken and his wife Julie got a nasty surprise. They suspected their waiter of spiding in their drink. It turns out, they were right. The angry diners contacted police. And the investigators went as far as testing the waiter's DNA, which matched the contents found inside the cup. The couple now suing for psychological trauma. This is an extreme case, of course. What would you do if you witnessed someone mishandling your food. On tonight's episode, we get the scoop and see how far we can push these customers. Can I get a scoop of the outrageous. Oh, shoot. Reporter: It seems outrageous. Five second rule. I think it's all right. Reporter: That's because it is. You want to they will me how much you want? Reporter: While some customers were more passive. This couple wasn't having any of it. Excuse me, I'm sorry. Yeah. You just licked his ice cream. It was dripping down the side. Yeah, but you licked the ice cream. I'm sorry, can you get another one. You caught it right away. We were won'tering what people would say. I thought, this cant be happening. I was stunned. We tackle all issues. Race, fosterror care abuse. Even parental bullying. "What would you do? Y "Is back. It airs tonight at 9:00, 8:00 central right here on ABC. Coming up, more Florence and the machine live just ahead.

This transcript has been automatically generated and may not be 100% accurate.

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