A recent foot injury had forced me to adopt weird walking habits.
Couldn't put the middle of my right foot down.
Crutches were horrible, a cane didn't feel right... I could, however, walk on my toes without much pain.
I've done that before, and now a few weeks of having no choice, and even a few soccer matches, I have to put in conscious effort to put my heels down.

Fun, and cool for running (braking, much less so), though I hear it's unhealthy.