Years back a couple buddy's and I hiked up into an alpine lake. When we got to the lake, the first camp we came to had a jacket and a pair of hiking boots sitting next to a make shift fire pit. They were in decent shape, and it was brand name stuff, so figured maybe someone else was up there, but out exploring.
We searched around for other camp sites, but that first one with the boots and jacket were really the prime spot, and since we didn't see any foot prints on the way in (we went back and checked the muddy stretch we came in on, and it was only our footprints going thru what was pretty much the only way to get there), decided the jacket and boots were probably left by someone on accident and they weren't staying there. But if they did come back, we agreed we'd get out of their spot. So we started setting up camp.
As we were setting up camp, I started getting a whiff of something really foul and nasty smelling. Hard to describe. Whatever the smell was, it was pretty rancid and gross. None of the other guys said anything about the smell, so I didn't make a big deal about it. Figured maybe it was just me.
Later in the day, the smell had me curious so I went looking around to see if I could locate the source of the smell - I wasn't sure if there was a cache or something nearby. Didn't find anything.
I mentioned the smell when I got back and the other two guys acknowledged it, that they could smell it too and that it was a bit unsettling.
We started thinking about it a bit more. There were no tracks on the trail in, which meant the boots and jacket had been there a while. Also, your hiking boots and jacket aren't the kind of thing you'd just forget on the hike out. We examined them both, and there was nothing wrong with them, so we concluded they weren't left/abandoned there as derelict gear someone didn't want the extra weight in their bag on the way out.
We talked thru other scenarios, but never could come up with one that made any sense, other than: someone was on a hike and got to their destination, took off their boots and jackets and set them down and went off with their day pack to go check out the surrounding area, but ran into some trouble and never made it out. As we talked thru that scenario, the smell started making more sense - the smell was the dead hiker nearby...
We looked around a little bit the next day, noticed some cat tracks over along the other side of the lake. Figured if there was a cat in the area it could've been hungry and that hiker could've been his breakfast.
I don't know, we're probably just being dramatic and it was a dead animal and someone honestly just left their boots and jacket.
That smell was really odd though.