Serendipity - n. an unexpected stroke of good fortune.
While one of its other definitions is 'an aptitude for making desirable discoveries by accident' I much prefer this one. Basically it would be what you'd have called the finding of the $20 bill without the ensuing parking ticket.
Personally, I like unexpected strokes of good fortune more than everything just going right in the first place. It's more interesting and it really makes me appreciate the flow of events more, and makes for a better story besides. For example, you might go to the store and return home. Uneventful. Unremarkable. Or you could forget to buy sponges, resign yourself to making an extra trip, only to find a 3-pack hidden in the back of the cabinet. O happy day!
Then again, I've always had more than my fair allocation of good luck. If it were otherwise I might be less favorably inclined to leave things to chance. As things stand, hurray serendipity!
By the way, I am aware that my scenario there and the description given of my own experiences with this phenomenon are, indeed, perfectly fitting for that other definition I said I didn't care for. What ev's, man. What ev's.