Originally Posted by JMM

I'm a lover not a hater but I have to jump in here because this is one of my pet peeves.

The correct expression is "I couldn't care less".

Saying that "I could care less" implies that you actually do care at a level above not caring.

Saying "I couldn't care less" implies that you care so little that it is not possible to care any less.

It's a very common mistake.

That is all, we now return you to your regularly scheduled programming already in progress.