Normally, I would have said that I eat the heels, which I do. However, whenever I come across a bread heel nowadays, it's when I'm working down at the halfway house on the golf course. Heels get cut into cubes and tossed out to the fish in the pond just outside the back door. You want to see a couple hundred bullhead catfish go into a feeding frenzy?
I've also been known to wad up the bread, mix in a little water, until it looks and feels like bread dough again. I take a little chunk, put it on a small fish hook, and go fishing.