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 online travel and entertainment deal company Travelzoo (TZOO -0.90%) took flight, advancing as much as 27%, after surpassing Wall Street's estimates in the fourth quarter.

So what: For the quarter, Travelzoo reported that revenue increased a modest 5% to $37 million. However, net income slipped 42% to just $0.24 from the year-ago period. More interesting was that North American revenue rose just 3% while European revenue jumped double-digits, 10%. Wall Street's forecast had been calling for Travelzoo to earn only $0.22 on revenue of $35.5 million.

Now what: Up as much as 27% for a 42% decline in net income? I know Travelzoo tends to be a very volatile stock, but sometimes the moves here are breathtaking and without reason. Travelzoo has smartly expanded its sales force and pushed its business overseas -- albeit to Europe, the toughest market for growth on the planet right now -- but it's going to deal with the high expenses and fluctuations associated with adding and training new people, as well as entering new geographic regions. At a valuation of nearly 20 times forward earnings and with subscriber growth for the year of just 5%, I'm not particularly impressed and will personally be passing on Travelzoo at these lofty levels.

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