gnu, that's my point. In the US if someone used 'practise', people would think it was a typo.

Magnetic Hill? In Oregon there is a place called 'Gold Hill' which seems to have the same properties. A ball rolls uphill, a broom stands while leaning uphill, you feel like the floor is far away.

That's when I was a kid. I have no idea whether the place is still open or if the mystery is intact.