- ―Darth Vader upon seeing a toilet
A toilet was a ceramic seat into which beings would shit and piss. Some toilets were exceptionally dirty, as the beings that shitted and pissed in them did not clean them. The Galactic Empire did not care much for toilets, as the Death Star seemed to be bereft of them, as did Star Destroyers. For this reason, most Imperial personnel had to wait when they got home to shit or piss or shit or piss their underwear.
Darth Vader used cybernetic parts to relieve himself since Obi-Wan Kenobi cut off his weewee and rectum on Mustafar, Luke Skywalker found his father's missing organs years later, frozen in carbonite in Obi-Wan's home on Tatooine.