Imagine you are leaving Earth tomorrow
You have trained for years. Thousands of people have checked the vehicle. The equations say the mission can work. But there is still risk, noise, uncertainty and a giant rocket filled with propellant waiting outside.
Humans often respond to high-pressure moments by creating rituals: repeatable actions that make the situation feel familiar. Athletes have them. Pilots have them. Space crews have them too.
That does not mean astronauts believe a breakfast or a peanut controls physics. Many space traditions are deliberately playful. NASA itself describes JPL's famous peanuts as more of a time-honoured tradition than a scientific belief in luck.
But some rituals really are described as good-luck customs — and crews often keep doing them because nobody wants to be the person who breaks a tradition just before launch.