One of my friends loved cats. He taught them to go to the normal toilet, so there were no problems with them. But one cat reversed the whole worldview of my acquaintance: the cat was sitting on the toilet, rushing into his cat affairs, and then the oak cover from the toilet somehow magically fell right on the cat's head. To say he was scared, to say nothing. However, after this incident, the cat did not stop going to the toilet, just he sat face to face to the tank and closely watched the lid.