There's a magic ton of books in my book bag as an example of blank my book bag stubbornly refuses all attempts to lift it even when I use both hands is an example of blank

The situation you described seems to be an example of hyperbole. Hyperbole is a figure of speech that involves exaggerated statements or claims not meant to be taken literally. Saying there’s a "magic ton of books" emphasizes the extreme weight or quantity in a humorous way.

If the context is about a struggle with an overly heavy weight, it could also be seen as an example of anecdotal evidence, as it describes a personal experience, or could even illustrate personification if the book bag is described as stubbornly refusing to be lifted. However, the most fitting term here would likely be hyperbole.