I'm gonna spit in this dish before I bring it out to this customer.
Why run a food business if you're gonna taint customer's food?
It's the grossest thing I can think of doing at the moment.
Would you want someone spitting in your food? Not only disgusting, but if you get caught, you're gonna be in a lot of trouble.
You are over reacting and taking it too seriously. No one would know.
It doesn't matter if anybody finds out. The fact is, tainting someone's food is wrong.