So many people used 'literally' sarcastically and hyperbolically, that it has literally taken on the additional meaning in most dictionaries. :|
http://www.merriam-webster.com/words-at-play/misuse-of-liter...
http://www.merriam-webster.com/words-at-play/misuse-of-liter...
There's a fat chance of that being true... uhm, I mean to say the opposite of "slim chance".
I thought only Arabic had those. I always thought it was stupid.
That said, most contronyms give absolutely no cognitive dissonance. That "to dust" something can mean to remove or to add something has rarely caused confusion. Only place I have ever seen it was in some old children's books, to be honest. Which is half the reason they are fun. Teaching kids contradictions is what keeps some of it interesting.