xhonzi said:

Couldn't care less/Could care less.

This is another one of my "words mean things" pet peeves.

Couldn't agree more, every time I see someone write "I could care less" they always mean "I couldn't care less", I just wish people would think about what they write.

I couldn't care less about x - means you are unable to care less than you do about x, there is nothing that you could possibly care less about.

I could care less about x - means there are things you could care less about than x, but this is practically meaningless, it just means you care about x to some unspecified extent, it's not the least cared about thing, it could be the most but then you should say "I couldn't care more", so really it is just at some unspecified midpoint in your range of ability to care.