Sk8 & Destroy
NEVER wore a helmet skateboarding, unless i had to. Only hit my head 2wice in 18 years. One of the times was someone else's shoulder, not the ground. Only takes one time, though...
So, when i started mt biking it was a big pill to swallow. For the amount of times i wacked my head on low braches and saw stars, I can even imagine how many trips to the ER have been avoided.
I think most people not wearing a helmet mtbiking, just started and don't have a clue. They'll soon figure it out, the easy way or the hard way.
I even started wearing a coconut cap for snowboarding, which i can believe either