I know there are many superstitious rituals practiced on the ground before liftoff. A well known superstition/tradition is urinating on the rear right tire of the vehicle bringing cosmonauts and astronauts to the launchpad at the Baikonur Cosmodrome for one.
But there are plenty of self-professed superstitions.
Steven Squyres, the principal investigator for the science instruments on the Mars Exploration Rover Project and a leading figure in Mars orbiter missions, said that those missions were plagued with so many glitches early on that he sought solace in an elk tooth from Lapland that he acquired during a bike trip in the 1980s. “I’m very superstitious when it comes to planetary missions,” Squyres, a protege of astronomer Carl Sagan, explained outside the APL, fingering the leather cord of his necklace. He takes it off only to replace the cord, leaving it on even when showering. “Everything was exploding, disasters were everywhere. I decided if ever I needed good luck, it’s now.”
Randy Gladstone, of the New Horizon's mission used a "decidedly non-tech talismans; like a faded, fraying bumper sticker on his 1991 black Honda Accord that says, 'My other vehicle is on its way to Pluto...I won’t replace that sticker [with an identical new on] until everything comes back.'”
The Russian engineers and technicians supporting the mission have their rituals as well. Rockets are delivered horizontally via rail and then erected at the Baikonur launch pad. As the rollout is monitored by workers, coins are placed on the rails to be flattened by the massive load, becoming keepsakes with a story. During fueling of the rocket, a woman's name is written on the side in the frost created by the supercooled fuel. Tradition turned superstition when this wasn't carried out leading up to the launch of a satellite in March 1980 and an accident during fueling left 47 pad workers dead. This checklist item has not been skipped since. American astronauts must have picked up the tradition as they began writing initials in the frosty liquid oxygen line fueling the shuttle.
Emphasis added to highlight the magical thinking of those involved.
But other than the soft toy mascot hanging in the Soyuz capsule, which I know serves a practical purpose as well, has any space agency, cosmonaut or astronaut discussed superstitions practiced in the ISS or during any earlier missions?