Countrywide's ( CFC) rally points to two days' worth of opportunity in some otherwise horrifically risky homebuilding stocks, Jim Cramer said Friday on CNBC's Stop Trading! segment. Cramer said he might "take a shot" at Hovnanian ( HOV), Pulte ( PHM) and KB Homes ( KBH) in the run-up to Wednesday afternoon's Federal Reserve interest rate decision. Cramer said Countrywide's 30% gain shows that shorts are covering en masse on Friday -- a scenario that Cramer believes could repeat itself in the hard-hit homebuilding stocks, at least until there's clarity on the next shift in Fed interest rate policy. Cramer also said he's rooting for Merrill Lynch ( MER) chief Stan O'Neal to ride out this weekend's boardroom upheaval. Cramer said he believes O'Neal has done a good job at the firm and the writedown snafu of earlier this week is his first big mistake. "I believe in second chances," Cramer said.