From the 1960s to the 1970s, Russian cosmonauts were issued alcohol rations to drink in space. While it is still officially banned, it is widely believed that cosmonauts still smuggle some into space.
Russian cosmonauts pee on the rear bus tire before a space launch. The tradition was started by Yuri Gagarin who did it out of necessity and Russians have since emulated him. Female cosmonauts bring along their urine in vials ready to dump on the tire so they can be part of tradition too.
Several long-duration Russian cosmonauts have reported that months after coming back to Earth, they occasionally let go objects in mid-air, still expecting them to float.