If you go to the restaurant and order something like soup and if the fly falls or hair appears in it, you ask the service provider to change it.
Mostly they take it and replace it with another.
So, a very simple life hack.
Don't give him a bowl of soup and ask him to bring another.
By doing this, you will be convinced that they have given you another soup, they have not caught you by taking out the fly.
Translator: It's a small thing, but we don't do that. The waiter carries such a thing. This makes it possible for the same thing to come back to you again.