Guys, I just can't stand it. I seriously have to say this, because my friend Stephen pointed it out to me the other day, and now I can't stop seeing it EVERYWHERE. If you are one of the culprits - do not despair - today is the day that you will never make this mistake again.
The phrase is: I couldn't care less.
NOT: I could care less.
People, by saying 'I could care less' is implying the exact opposite of what you are feeling.
So there you are. My lesson completed. :)