The Disabled Hiker, short clip. Pepper Spray v's Bear Spray.

http://youtu.be/yJjNHlXJyS4

 After years of hiking the trails of Eastern Pennsylvania. I've learned there is no substitute for experience.
However, when it comes to dealing with wildlife that outweighs you by 300 pounds, can run 15 to 20 miles an hour, and has about 10 times your strength. One must be careful what they are considering calling "Experience".
In this video I explained some of the finer differences between using self-defense or police grade pepper spray, and Bear Spray that is sold specifically for that purpose.