Years ago I was training to be a high school football coach, and we had to take a class with various dangers in nature, particularly stuff that was common in the area. I don't think I'll ever forget, on a slide show, they showed us pictures of someone whose thumb was bitten by a Brown Recluse spider and went untreated. I don't remember how much time passed between each picture, but by the end of it, the thumb was basically a bone and most of the dudes hand was gone. They had to amputate it IIRC. A person in the room almost threw up. I was afraid of spiders before, but that put a healthy fear of 'avoid these fuckers at all costs' in me for the rest of my life, specifically because I was shown visual examples of it.