pike belly

wait for it...

https://youtube.com/shorts/2fvYhpojlN0?feature=share

My guess was a shoe 

That was a pretty frisky bluegill! If they had dropped it into the water, it looks like it would have swum away, none the worse for its stay in the pike's stomach.  I recently caught a pike while ice fishing which coughed up a perch which was still slightly alive. I dropped it back into the water, but it was too far gone to swim down out of the hole.