Streetpong [video]
This looks a little dangerous to me, because it makes the pedestrian take their mind off the road. Just last week, a car accidentally drove up on the side walk part of the crosswalk and would have hit me had I not been paying attention and jumped out of the way. From what I understand this is not an uncommon event either. It's not like the lip of the curve is really any protection against the cars, a car can easily drive over it.