...we could naturally walk vertically up walls...

...then we could get rid of stairs in buildings. We would only need a shaft of some sort and people would be able to walk to their respective floors. Apart from that it would immediatly mean that people falling of buildings would simply grab on to the walls and immediatly be safe. Of course, if we can do it, machines to drive up walls would exist as well and so one could use a regular car to climb Mount Everest. Not particularly useful, but a fun thing nonetheless.