Yeah... I could care a lot about the 'couldn't care less' thing. Or how do I say "it bugs me"?
Another one that the dictionary seems to have betrayed me on is: insure vs ensure. I was taught that "insure" was to take out a policy against something and "ensure" was to make sure. Almost everywhere you look, people only use "insure" for both meanings. The dictionaries I looked at seem to reflect this, yet I sware that it hasn't always been so.