I've a friend here from Kenya, who told me a very interesting story the other day...
He says that there's a hill that he's been to, in Kenya, where cars roll uphill on their own accord. Water, too. He gave me the name of the place, which I'd forgotten, but a simple search for "kenya gravity uphill" put me back on track.
Kituluni hill is the place, and - along with Menengai crater - is considered one of the most unusual places on this planet (
1,
2). I would disregard this as pure legend were it not for this person's testimony; he was there and saw their car roll uphill while the engine was turned off.
Apparently, there's never been any serious scientific study of these places, which I find just as bizarre as the reports about these mysterious happenings in the first place.