In the choppier markets since, the can't-lose derivatives have come back with a vengeance.

FORBES: Guaranteed to Go Up

"Sales productivity has come back with a vengeance, " said Cedrik Lachance, an analyst with Green Street Advisors Inc.

WSJ: Starwood Capital Goes Shopping for Malls

Special Offer: Since May, small-cap growth stocks have come back with a vengeance.

FORBES: Gurus Buy Biotech And Software, Sell Health Care

The estate tax could come back with a vengeance in 2013.

FORBES: With Trusts, 'Crummey' Is Good

During the flu pandemic of 1918, cases began in the spring and then faded away during the summer, only to come back with a vengeance in the fall and winter.

CNN: Commentary: Flu shouldn't close Mexico border

Coming off of a 48% return in 2003, and a 25% return last year, Muhlenkamp is up 4.2% in 2005, but the large-cap blend fund has come back with a vengeance in the past eight weeks, advancing 11.2% since April 28.

FORBES