This is just a superstitious believe by some gamblers because it's not totally true that when you have a negative feelings it will affect your luck, these luck in question happens randomly irrespective of how someone is feeling but being anxious is just like a natural feeling that some people have when they go gambling because they are scared off losing.
You can't even imagine how many superstitious people there are in the world. I personally saw how casino players resort to various rituals. I even feel a bit awkward for them. I feel some kind of Spanish shame. Well, what you won't see in the gambling business. But no rituals work at all. People continue to lose money the same way they did before. Therefore, you should think with your head several times, and only then start playing.
I personally don’t believe on those rituals because there’s no scientific evidence that it has effect on the outcome of the game. But I don’t discourage people on resorting to that method if that will spice up their gambling experience.
Gambling is based on luck especially casino games so the result will still the same regardless of what we will do.
The only thing we can do is to enjoy gambling based on each result so if some people want to do ritual then that’s their own way on having in gambling most importantly if they won using that method.