This is in one of the old episodes with Miss Bliss -- the one where Zack and Nikki are fighting (as are Miss Bliss and her friend Tina), and Miss Bliss assigns a project where the students have to try and market some old American inventions (telephone, typewriter, lightbulb). In the beginning of the episode, when the students are coming into class, you clearly see that instead of writing "American Inventions," Miss Bliss has written "Amesican Inventions."