The hardest thing in writing about companies isn't making sense of pro forma numbers, calculating free cash flow, or even thinking up a novel perspective to take in analyzing either one of those. The hardest thing is coming up with an original title. So when a company like chip maker Silicon Labs (NASDAQ:SLAB) gives you an opportunity to reuse an old title in a new way, you take it.

Three months ago, in a column also titled "Silicon Labs Goes Boom!" I described how, after the company warned Wall Street that it would likely take in "only" $95 million in Q4 2004, its stock exploded -- as in, into smithereens -- down 21% in a day.

Yesterday, Silicon Labs confirmed that it made that $95 million it had been expecting for the quarter. In response, the geniuses on Wall Street looked at the same numbers and reacted in the exact opposite manner to three months ago. In an explosion of investor enthusiasm, this Motley Fool Stock Advisor pick rocketed up 21% in the after-hours market, cresting the day at $33 and change.

It makes you wonder what all the fuss was about back in October. Silicon Labs warns. Its stock collapses. It proves true to its warning. Its stock soars. I mean, what's the frequency, Kenneth?

Sometimes, there's just no understanding Wall Street. Fortunately, when picking Silicon Labs as one of his Stock Advisor selections back in September (and again in November), Fool co-founder Tom Gardner wasn't listening to the voices carried on the winds from up north. Rather, he focused on the stock's fundamentals, and therein saw value. Value in the form of a company whose 2004 revenues increased 40% over 2003. Whose earnings for that time period leapt 72%, and whose diluted per-share earnings followed close behind at 62% (share dilution of 5% accounted for the difference between net and per-share profit increases).

Tom also saw a company that, despite the past year's amazing growth, increased its inventories at a rate far slower than sales grew -- just 13% (while industry stalwart Intel (NASDAQ:INTC) watched its finished goods inventories rise 17% and AMD (NYSE:AMD) saw its inventories overall rise by 25%). He also took note of the high quality of Silicon Labs' earnings, to which the company's ability to reduce its accounts receivable despite increasing sales bore testimony.

When you've found a company producing those kinds of numbers, and for whatever reason, the Street decides that it deserves to go (the bad kind of) "boom," that's the time to go out and buy more. Because you know that an explosion to the upside is just around the bend.

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Fool contributor Rich Smith owns none of the companies mentioned in this article.