I only go out picking fruit as long as I am absolutely certain I know what fruits I will be picking, such as wild blackberries. I have come across some instances of people who thought they had it covered, but then had some sort of misfortune. The most common sort of incident I've heard of involves someone, for example, failing to tell the difference between common field mushrooms and the amanita phalloides, the deathcap mushroom(easy to do), and then dying in agony some time after.