George's Marvelous Medicine by Roald Dahl

In George's Marvelous Medicine by Roald Dahl, little George Kilicranky is bullied by his mean grandma, especially when his parents aren't around to witness it. What does he do to get back at her? Invent his own medicine for her of course, and give it to her instead of her regular medicine.

What are the results? Some pretty crazy ones! Grandma grows so tall, she breaks through the ceiling into the second story, and again through the roof. What happens after that? Some more pretty crazy stuff! I appreciated the warning that the things that go into the medicine in the fictional story would not work the same way in real life, and could actually be dangerous. (The ingredients include, [among many hazardous things] engine oil, paint, and other things that would actually poison and kill a person in real life.)