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: Communications chip designer Skyworks Solutions (Nasdaq: SWKS) took a plunge this morning, the size of which is open for discussion.

So what: According to third-party market services like Yahoo! Finance and Google Finance, Skyworks hit a low of $20.09 per share overnight to set a three-month low. But go to Nasdaq's own reports and you'll see a much fainter 2% drop to $28.60 per share, which is right about where the stock is trading as of this writing.

Now what: This, dear Fool, is exactly why you should always use limit orders when you buy or sell stocks -- and perhaps stay out of pre-market and after-hours trading altogether: Skyworks' off-hours trading is always wafer-thin, and it doesn't take much volume to exhaust the order book on either side of the buy/sell equation. When that happens, some poor sod can get stuck buying or selling the stock at entirely unreasonably prices. That's what happened here, and it could happen to you, too; after-hours trading is not for the faint of heart.

Interested in more info on Skyworks Solutions? Add it to your watchlist.

Fool contributor Anders Bylund holds no position in any of the companies discussed here. 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.