Several years ago, I was catfishing one night at Pigeon Creek area of Lake Norfork. Sitting on the tailgate of my truck, I seen something huge swimming across the lake. I grabbed my spotlight and shined it toward what I saw. KERPLOOSH!! What ever it was made a BIG splash as it went underwater. A while later, whatever it was, I could hear it walking up the bank about a hundred yards or so away from me. Grabbed the spotlight again and shined it in that direction. Couldn't see dung except the trees.
To this day, I still don't know what it was. I mentioned it to my dad at the time, and he suggested maybe a bear. I still think about that whenever I go night fishing there.