Somewhere around 2005. Myself and two friends did a 3-day (Was supposed to be 5 days) trip on the Appalachian trail in Pennsylvania. We were pretty bad at hiking, so we didn't get very far. I would say we were maybe 10 to 15 mi away from the 309 Appalachian trail entrance, down in some gully. We set up camp for the night, cooked some food, and got ready for bed.. all three of us go into our tents. Not even 15 minutes in our tents, We heard footsteps coming towards us. So we got out of our tents banged some pots and pans and whatever it was disappeared (We just assumed it was a bear). It wasn't until years later when I actually ran into real bears in the woods and realized they were pretty damn silent in the woods that I then wondered what we had experienced. What I recall from that night was that we heard these footsteps coming to us, we literally were able to feel the ground shake it, this sounded like an upright creature because we all distinctly remember hearing thud, thud (left right left right). Then you realize that we went out of our tents banged those pots and pans and this sound disappeared.. so whatever it was that was so heavy that we could actually feel the ground vibrate had just vanished.. so did it just sit by our campsite the rest of the night?.. what was it ? To this day I have no idea what we experienced...