TheStreet.com's Jim Cramer says false correlations can lead you to despair -- you need to see through them.

At moments like this, you have to figure out what will be affected and what won't be, and you need to recognize that the interrelation of all stocks to these events is a false one.

There is no doubt that anything mortgage is troubled. So even though I like Wells Fargo (NYSE: WFC) (Cramer's Take) a great deal, it is unlikely that WFC can stay anywhere near up here now that Lehman (NYSE: LEH) (Cramer's Take) collapsed. I don't want to hazard a guess, because it would be a guess, about where that stock can trade. Obviously it is a buy at some price, but that's a difficult issue.

Stocks like Schwab (NASDAQ: SCHW) (Cramer's Take) and Capital One (NYSE: COF) (Cramer's Take) are difficult to figure out, too. Schwab has nothing to do with this mess, but maybe trading will slow. People might look at the numbers Capital One put out about defaults, and while they seem pretty darned good, does anyone care? That stock had been on a rampage; probably stops today.

But how about the stocks on the Nasdaq? The Nazz futures are indicating down huge. Does that make sense? Just because it is happening, does that make sense? Symantec (NASDAQ: SYMC) (Cramer's Take), positive article this weekend -- a buy? If the futures take it down, yes. Amgen (NASDAQ: AMGN) (Cramer's Take) with new data coming up? Yes. Celgene (NASDAQ: CELG) (Cramer's Take), which wouldn't come down last week? Yes.