"I could care less"

Oh you could could you?  So your current level of "caring" is higher than than some absolute minimum?  Just like every other level of "caring" right up to "I care quite a lot".

Personally, "I couldn't care less" meaning that it is not possible for me to care any less than I do, my caring quotient is lower than low, it is the least it possibly could be.

(How I wish I cared less about people saying "could care less".)