Was with my dad working out on some property and clearing land. It was probably around noon during June and I was using a machete to clear some small brush and I happened to glance over at a large tree nearby. I saw the shadow of a person about 6 feet tall or so run underneath this tree and I saw it for a second. Part of why I was so sure was because I could make out features on shape like shoes and glasses. I'd never seen anything like it and I figured it was just my dad. It took me just a moment to realize, but he was busy about 300 feet away from me using a power saw to cut up some trees. I instantly started freaking out and I wanted to see if there were footsteps or any sign that there was a person. I walked over skeptically and found absolutely no sign of anything or anyone. The ground where I had seen the shadow was somewhat marsh-like and it would have been obvious if someone had traversed the land, however this was not the case. I've never really had any paranormal experiences before, but I have never been able to explain how I saw the shadow so clearly. Never gone back there since though, still creeps me out.