I remember reading an interesting entry in the punchbowl shelter register...
Apparently this guy was on a solo overnight and stayed there alone. In the middle of the night he woke up to what sounded like an animal in the shelter, but when he shined his light, there was a little boy rummaging through his pack. The boy was startled and ran off into the woods (the hiker didn't follow him because it was winter). Next morning he found his clothes folded neatly beside his pack.
Likely fabricated, but eery nonetheless. Especially when you're there!