The Sket-dan get a new assistant homeroom teacher (who wants everyone to call her, Onee-san), but she's a klutz and is upset she can't be a good role model for the students, so the Sket-dan ask Chuu-san to help with some of his strange drugs. Later, Switch goes through some old inventions of his that didn't work out as intended...
Like we can't wait to see 
what crap you pull out next!
No es como si estuviéramos ansiosos 
por ver con qué sales ahora.
No es que estemos entusiasmados
por ver qué viene ni nada.
Até parece que a gente quer ver
 a porcaria que você vai tirar daí!