How many kidneys do we have?

Teacher addresses a student and asks: “How many kidneys do we have?"
“Four!", The backbencher student responds.
“Four? Haha,” The teacher was one of those who took pleasure in picking on his students' mistakes and demoralizing them.
“Bring a bundle of grass, because we have a donkey in the room," the teacher orders a front bencher.
“And for me a coffee!”, the backbencher student added.
The teacher was furious and expelled the student from the room.
The student was, by the way, a famous humorist namely Aparicio Torelly Aporelly (1895-1971), better known as the "Baron de Itararé".
On his way out of the classroom, the student still had the audacity to correct the furious teacher:
"You asked me how many kidneys‘ we have.
"We have four: two of mine and two of yours. ‘We have’ is an expression used for the plural. Enjoy the grass".
Life demands much more understanding than knowledge 😊😂