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Could care less = couldn't care less

Posted by Anders on November 16, 2005

I heard Dr Phil (Frazier Crane on TV) use the expression "could care less" when in fact he means "couldn't care less". Although the two expressions are logical opposites, I quite often see them used interchangeably in Internet forums. My question is, if you find this to be an error, or if it is actually legitimate to say, as Dr Phil did: "She could care less about what you think" when you mean "she does not care (at all) what you think"?