The chemistry teacher approaches Johnny.
The chemistry teacher approaches Johnny and asks him a question during an oral evaluation.
- Johnny, what's the chemical formula of sulfuric acid?
- Oh god I have it on the tip of my tongue! - answers Johnny, not remembering the answer outright.
- Spit it out Johnny for god's sake!!! Sulfuric acid is corrosive!!!- replies the worried teacher.
Why don't Gingers go to the dentist?
They are already aware of their corrosive gingivitis.