"I thought it was a snag"

One day my dad and I were fishing on the Mississippi. Then I saw the tip of my rod bend down. So I set the hook. Nothing happened so I looked at dad and he looked at me. We both thought I was snagged. Then I handed my pole to him. In the next instant there was a zzzzzzzzzzzzzz and my line was going upstream. Then it came back towards the boat. Then he settled in a hole, and my dad pulled and pulled and couldn't get him off the bottom. Suddenly SNAP the line broke. In the end my dad thought it was a big flathead catfish.

Thanks for the story!