I did, actually. I was 3 months premature and my motor skills were delayed because of that. When I finally started walking, I walked on my toes so consistently that the achilles tendons didn't stretch fully - on my right foot it never stretched long enough and I can't walk heel first on that foot. Makes dancing difficult, especially when I picked up ballet as an adult, it was too late to really stretch them. Driving a car is hard too.