My grandma's the most careful, safe driver in the world. You put her in a rental car, and she's doing doughnuts in the K-Mart parking lot!
Imagination, it turns out, is a great deal like reporting in your own head. Here is a paradox of fiction-writing. You are crafting something from nothing, which means, in one sense, that none of it is true. Yet in the writing, and perhaps in the reading, some of a character's actions or lines are truer than others.