This is hilarious

When a black bear approaches a hiker and shows bluster, some people think the bear learned to do that to make the person drop his or her backpack. In fact, brochures along the Appalachian Hiking Trail advise people to do just that. In truth, bluster means a bear is too nervous to approach calmly. Blustery bears are particularly easy to chase away. Nevertheless, hikers who see blustery bears often drop their backpacks like the brochures say, making some people wonder if the bears wrote the brochures.

http://www.bear.org/website/bear-pages/black-bear/bears-a-humans/199-what-if-i-see-a-bear-that-seems-threatening.html