Oh what an adrenalin... I had wooden staircase and steps that we polished with pronto. It had carpet through the middle but if i catch the edge... woooohoooooooo

Oooh, wood, deadly. We have "just" somewhat polished stone swirled inside a tower- now it sounds like I was raised in catacombs. Nevertheless, if you didn't make the turn properly and slowly, you'd continue on your back.