It is astounding the number of people who use the phrase "I could care less." Little do they know, they are saying the exact opposite of what they mean. If they really stop to think about it, they want to get across the point that they could NOT care less. In fact, they care so little that it isn't possible to be more indifferent. Incorrect: could care less Correct: couldn't care less
~Reinforcing Proper English by Reviewing Punctuation, Grammar, and Spelling Rules