Joke: Types of gas

A teacher entered a class for her normal teaching duties...

She wrote science on the chalk board and said: "Class! today we are going to learn science"...

Teacher: Can you please name few gases?

Walters: Oxygen.

Fresh kapito: Carbon Dioxide.

Teacher: Very good both of you!

Jerry, a lazy student who mostly sleeps in class started laughing hard... When asked why, he replied...

Jerry: “Madam please you forgot one type of gas”

Teacher: well, tell us...

Jerry: FABREGAS!