Dont get us started on Koalas, but drop bears well now thats a different story. Really not your average attack bear but still could be deadly. If I came up against one of your grizzly bears then I would most likely run away screaming like a little girl those damn things are big plus I dont carry any weapons when I go camping. So running away like a little girl would be the most bestest course of action.
PS. You dont tell no one about running and stuff you keep that one locked away for a rainy day.

With Drop bears, always look up before putting your tent up..