http://en.wikipedia.org/wiki/Serendipity

Serendipity means a "happy accident" or "pleasant surprise"; specifically, the accident of finding something good or useful without looking for it. The word has been voted one of the ten English words hardest to translate in June 2004 by a British translation company.[1] However, due to its sociological use, the word has been exported into many other languages.[2] Julius H. Comroe once described serendipity as : to look for a needle in a haystack and get out of it with the farmer's daughter.[3]