Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Country Style Cooking Restaurants (Nasdaq: CCSC), a chain of quick-service restaurants in China, dropped 15.5% on heavy trading today.

So what: The company reported fourth-quarter earnings today, missing analyst estimates of earnings by a penny but beating the revenue consensus. Next-quarter guidance was in line with Street targets. Chalk up the drastic drop to investors still getting used to the company; this was just the second quarterly report since Country Style went public last September.

Now what: Country Style's stated goal is to become "China's leading quick-service restaurant chain." That's a very ambitious goal; Yum! Brands (NYSE: YUM) holds that title with 3,200 KFC outlets in China and is about to hit the $1 billion annual sales benchmark in the Chinese market. That's nine times larger than Country Style's 2010 revenue haul. In the meantime, expect this stock to jump around like a live cricket in a hot wok.

Interested in more info on Country Style Cooking Restaurants? Add it to your watchlist.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. Country Style Cooking Restaurant Chain is a Motley Fool Rule Breakers recommendation. The Fool owns shares of Yum! Brands. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool is investors writing for investors.