I picked out a nice black walnut to saw down this morning, my dad turns bowls out of them.. I notched it, made the back cut and it started over like always.. then all of a sudden.. that son of a gun split right up the middle.. the whole tree went up and 20-25 feet in the air.. I guess I was in shock and awe.. for some reason I couldnt get my feet to move.. of course it was only about 5 seconds.. but it seemed like it was in slow motion.. then here it come.. right at me.. my feet moved then.... its pretty much firewood now.. i'm sure i can save a few pieces..