God answers prayer
Earlier this week my wife and I were entrenched in a disagreement, and it was not getting better; in fact, our efforts seemed to be making it worse. But then we prayed, a few others prayed for us, and amazingly, in the middle of a conversation, something changed and things got immediately better. It was weird, and I take it as an answer to prayer.
(Tangent: it just occurred to me that "luck" is a far more dubious concept than "prayer".)
Post your own answered prayers or prayer requests.