Mnemonics is the art of assisting your memory by using artificial aid such as rhymes, songs, or acronyms. In this example, you will learn how to count in French until the number six:

“Un.. deux.. trois.. – cat sank!” (oh cease, please!)
(un, deux, trois, quatre, cinq, six…)

You can find a lot of other examples of mnemonics technique for math, physics, astronomy, etc. at http://www.eudesign.com/mnems/_mnframe.htm.