Do Toilets Really Flush the Opposite Way in the Southern Hemisphere?

Does water drain in different directions in different hemispheres? You've almost certainly heard about this before. The idea was used as the basis for an episode of The Simpsons, about toilets flushing the opposite way in the southern hemisphere. I've also written about this many times, including in my first book Bad Astronomy, and also here on the blog. In the latter case, it was about debunking fraudsters tricking tourists at the Equator about the effect. Here's the thing: This effect is real....