orannis62 said:
"I could care less." Incorrect, you Couldn't care less.
Either can be correct. In one case, there might be even deeper levels of apathy in which case I could, in fact, care less. In the other, one has reached the deepest level of apathy, and as such they are incapable of caring any less then they currently do. Realistically, most of the time the correct version is "I could care less", because if they care enough to respond to an inquiry on the subject then there is clearly at least one step further (ignoring the inquiry altogether).