Apparently if you do not run or act aggressively towards a grizzly bear, or even try to play dead by keeping still and calm, it probably won't attack you. Contrary to popular belief, bears don't eat people either. However as Box points out, with the spiders it would only take one or two of those million to bite you and you might suffer a painful, slow death. So I'll choose the bear. And try not to panic. Much.