If you go to [link|http://www.howstuffworks.com/|How Stuff Works] and navigate to [link|http://home.howstuffworks.com/toilet.htm|How Toilets Work], you will find a description of a typical cistern and pan in North America (that is where the writer is located, after all). According to Marshall Brain's article, toilet pans completely empty upon flushing, then refill as the cistern is refilled. This is due to their being a feed from the cistern into the siphon as well as into the rim.

Australian toilets are not constructed to that design. When flushed, Australian toilets put all of the cistern water into the rim. The result is a continuous movement of water down the bowl and through the S-bend for some seconds. The pan does not empty and then refill. Coriolis doesn't have a chance.

Wade.