If something HAS value it is expensive, if it IS a great value, it is cheap. Hmmm…

The English sentence “Our product is a great value” (meaning: is a bargain), gets translated to “Vores produkt har stor værdi” (Our product is worth a lot, i.e. more or less: is expensive), which makes me notice how we some times in English use a word totally opposite of its original meaning.
The current slang use of “sick” as meaning  something GOOD comes to mind, or “downhill from here”, which is good if you’re on a bicycle, but bad if you’re turning 50 years old.
There are more examples of such words, which can mean the exactly opposite depending on context, at http://en.wikipedia.org/wiki/Auto-antonym