I've seen a LOT of stupid things over the years, let me tell you about one that really surprised me... Here in Colorado, we have a lot of mountains over 14K ft, we call them 14'ers, and love to hike them. My wife and I have done over a dozen, and will hopefully do a dozen more before it's too late...
There's a lake outside of Alma, CO, called Kite Lake. You can camp a short distance from it, and get an early start, as there are 4 14er's around it. That's right, you can bag 4 in one day. We've done it a couple of times.
One time that we did it, about half way up the first one, a guy who looked in his 50's, bald, wearing a t-shirt, nylon running shorts and running shoes passed us on the way up. He had a small butt pack with 2 one-liter water bottles, and a German Shepherd. He also had quite a pot belly, and we were all wondering if we would have to carry him off the mountain. Well, by the time we got about 2/3 the way up the first, he bagged it, and was down halfway between the first and the second on the saddle. When we got to the top, he was headed towards the third. By the time we got to the second one, he was on his way down from the fourth.
It took us about 6 hours total, he and his dog did it in under 3. If he had pulled out a pack of smokes, I wouldn't have been surprised. He blew everyone on the mountain away. I have no idea who he was or how he did it, but it sure humbled me that day.
Sometimes, people surprise you.
I still wonder if he wasn't some famous runner in his youth, and still had a great circulatory system or something...