I don't believe in good luck or bad luck i think that its upto the person to achieve things in his life ..i give u an example with my students..when they flunk they say was my bad luck if they pass they say i really studied hard and my luck was wit me...hmmm..maybe at times people do try hard and they dont come to their expectation they blame luck..i believein destiny more than luck and donno if luck and destiny are related ..

not sure