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ddobson said:
"I could care less," when what the person really means is he/she could NOT care less about the topic at hand. I could care less than I do about anything I'm passionate about. "I could care less" implies SOME level of interest, but that's not how people use it. It's like an invisible double-negative.

I agree with this so much! I was going to post it until I saw this. 

Another one is 'addicting'. It's addictive! Addicting isn't a word. I think they're both Americanisms, don't really see them in the UK.