I hypothesized that the water in the Northern Hemisphere would drain counterclockwise. If a hurricane spun that way here, I had always assumed that was the case with water anywhere. And yes, that Simpsons episode were Bart goes to Australia was involved in my reasoning. As we were doing the experiment, there was a concensus of counter-clockwise, but there was a sense of doubt in the air. It seemed hard to tell, even with the paper as a resource.
It turns out, however, that this is a complete myth. People assume the macro scale impacts of the Coriolis Effect would apply to objects on a smaller scale like a sink, which isn't the case. According to the Huffington Post, this helps to explain the phenomenon in which the rotation of the earth can cause things moving in a straight line to appear to follow a curving path. However, the Coriolis Effect has minimal influence in how water drains in the sink. It could potentially, but this is currently impossible to measure. It depends on the shape the sink, the shape of the spout, if there was a force (like a hand) involved in spinning it a certain direction, etc... It doesn't matter whether you are in the Northern or Southern Hemisphere; it could go either way.