A:
It turns out that anchovies are totally delicious.
B:
You know those are little fishes, right?
A:
Yeah. Obviously.
B:
In fact, there's model of the world in which anchovies are not normal fish at all, but instead are the little bits of crumbs that fall out of God's mouth when he's chewing. When they land in the sea, those little crumbs become anchovies.
A:
That's not a model of the world, at all. Models have to have some kind of explanatory power. And, make at least the slightest bit of sense.
B:
Well, it turns out that the anchovies-as-God's-mouth-droppings model ends up entailing a lot of other facts about the world. That God is real, for example. And that he eats food, although the exact nature of the food isn't specified in the model.