I loved this.
"That's right, it becomes a watermelon". God, that made me laugh.
Very few animations follow this "1920's educational" style and pull it off as well as you have. First off, your voice was perfect for the role, classy and distinct. Great work on that. The background music wasn't too jarring and in your face, which a lot of animations like this fail to avoid.
The animation was quite good at some parts, some decent frame by frame work and visually arousing backgrounds.
Overall, a hilarious animation. Great work.