The Coriolis effect, which suggests water drains clockwise in the Northern Hemisphere and anticlockwise in the Southern Hemisphere due to the Earth's rotation, is insignificant in toilet flushes. The difference in river erosion on the right and left banks proposed by Baer's Law of Stream Deflection also has little to do with the Coriolis force. Instead, the tea leaf paradox and the circular motion it creates can impact rivers and cause erosion.