Fishing for crappie 12' deep ,though i was hung up,tried to shake jig loose didn't work, put a spark plug on line and shook it and the hang started moving. fought it for 15 min. with all the pressure i could use with a 12' rod suddenly the line goes slack and a 20# turtle stuck his nose out of the water for air and went back down for a minute and got off. though i had a big flat head . it had my arm wore out but i saved my jig and spark plug. spark plugs save 90% of my hung up jigs.