When Billy Jackson woke up Thursday morning, he expected just another ordinary day. "I didn't make any special plans or anything," the 38-year-old father of three said. "Just take the kids to school and then work from home. Maybe play a little PS4."

But when Mr. Jackson went outside, he noticed a small ding on the rear door of the passenger side of his car. It's not the first blemish on the 11-year-old vehicle--which has 133,000 miles and a check-engine light that remains on at all times--but it's the newest.

"For the life of me, I can't figure out where it came from," said Jackson, who bought the car nearly a decade ago in "like new" condition with a 3-year/30,000 mile warranty from the car dealer up the road from his home. "But it's the kind of thing that just bugs you until you find out."

Jackson plans on re-tracing his steps from the last few days and talking to as many people as he can to see if he can shed some light on the mystery. "I've been looking for new golf clubs, so I've been in and out of a bunch of sporting goods stores, lately. Maybe they have security cameras of their lots," he said. "Naturally, I'd be grateful to anyone that could help out."

"I can tell you one thing," said the man who still hasn't finished painting the molding in his oldest daughter's room no matter how many times "the annoying nag who thinks he has nothing but free time" gets on his case about it, "I won't rest until I find out what happened."