In the real sense of the word it occurs to me at time when you have no clue what is going on. It can be either favorable or unfavorable for you. If it is favorable ? Then yeah you have got some luck. But the problem is not about the impact to you but how long it will be affecting you. If it is favorable and it is going to affect you for a longer time, Then? Hell yeah.. You must be happy about it.
When it pops out of no where in the middle, definitely you will be confused but if you sense that it is no longer is none of your business, just let it go. Don’t hang onto it.