Yup. I believe in luck.
I have no explanation for it...but I have seen pretty consistent results that make me think that every person's "luck" works differently.
For example, my luck tends to be VERY good. I tend to consistently get "lucky breaks", whether it be a last second assignment delay (that came out of the blue) that allows me to finish an assignment, or a simple dodge-two-subsequent-lethal-blows-and-land-3-critical-hits-to-finish-off-a-super-hard-boss in a turn based RPG. However, I pay for that by having totally crap luck in cards and dice (especially dice).
Then, you have a good friend of mine, who generally has bad luck. He gets no real breaks, and stuff breaks down on him at the worst possible times (the day he has an exam in the morning, is the day his car refuses to start, for example). But his luck skyrockets whenever he's in serious trouble. As a kid, he was home alone, and cracked his head in on a marble table by accident. Then, his grandparents that he rarely ever sees come by for a surprise visit (that never happened before) mere minutes later, and are able to get him to a hospital. Then, there's the time he got into a head on collision with a car while he was on a bike (no helmet), and due to the angle at which his head smashed into the windshield, he only got a mild concussion and a few bruises. And just recently, a car cut him off and he rammed into it, making him "at fault" because "whoever hits from the rear did it"....And then the cop noticed that ALL the debris was in the striped zone, making it clear that the woman had made an illegal move, making my friend totally not at fault. ...Oh, and the insurance paid for EVERYTHING. So yeah, his luck is Damage Control.
These are the two most obvious cases I know of.
But yeah, because of the consistency of these events, I believe that each person's luck works in a different way. Call me crazy if you want, but this has been my experience.