Prashant Gopal / Business Week / Yahoo Finance

By April, 2009, hundreds of thousands of option ARM mortgages will begin resetting, bringing on a fresh wave of foreclosures.

The American homeowner must feel like one of those characters in an old cartoon who has just been hit by a falling piano. After dusting himself off and touching the large bump on his head, he probably doesn’t expect another piano to be dangling overhead. But he’d be wrong.

But what’s often funny in a cartoon is anything but in real life. With the subprime mortgage crisis already crippling the U.S. economy, some experts are warning that the next wave of foreclosures will begin accelerating in April, 2009. What that means is that hundreds of thousands of borrowers who took out so-called option adjustable-rate mortgages (ARMs) will begin to see their monthly payments skyrocket as they reset. About a million borrowers have option ARMs, but only a fraction have already fallen due.

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