Cramer's 'Mad Money' Recap: Look Who's Toxic

On the subject of mortgages, Cramer says "what was negative four weeks ago is now positive for banks." He reiterated his buy calls for Lehman Brothers, Bear Stearns and Goldman Sachs, which he owns for his charitable trust, Action Alerts PLUS.

As for Impac Mortgage, Cramer says it's "the kind of stock that could double on any good news."

'Green Day' III

Cramer continued his weeklong segment about the April 2 Supreme Court decision to allow the Environmental Protection Agency to cap greenhouse emissions, a judgment likely to benefit companies that are environmentally friendly.

His latest "Green Day" pick is auto-supplier BorgWarner, because the company is "all about controlling emissions and enhancing fuel economy, exactly what we are after in a post-Green Day world."

BorgWarner's backlog of orders is growing because of demand for products such as its fuel-efficient turbochargers, said Cramer.

Even though the company can help save the planet, some investors still might be worried about investing in an auto-parts company, he said.

But Cramer believes that BorgWarner won't be hurt by the struggling U.S. auto industry because it does most of its business with foreign automakers that are in better financial shape.