It reminds me of a presentation i did when i was studying finance in University.
I had to convince people that human beings are not rational in opposition with the concept of Homo oeconomicus. I had to show that our investing behaviors are impacted by external influences.
You can see for example here that the full moon had a bad influence in investment decisions.
Most of the time, with the full moon, people are pessimistic, feeling angry or uncomfortable.
It is what it is :)