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.