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: Pep Boys - Manny, Moe & Jack (NYSE: PBY) dropped 19% in intraday trading today after earnings badly missed expectations.

So what: EPS of $0.23 showed no pep. It was flat with the year-ago quarter and well short of the consensus estimate of $0.30.

Now what: Revenue of $514 million, up 1% year over year, fell short of the consensus forecast of $537 million. Growth in the services business was held back by a decline in merchandise sales. Management said the weakness was due to gas prices, which constrained consumer spending, and rain, which reduced demand for "appearance products." With EPS and revenue roughly flat year over year, this stock will likely need some pep in the economy and/or the weather to get back in gear.

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Fool contributor Cindy Johnson does not own shares of any company named above. 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 has a disclosure policy.