Lovely Mistake

Teacher asked from their student.
Draw the shape of earth.
First student came and drawn it like egg.
Teacher;scolded him.
Another student came and he drawn it like haif moon.
Women teacher :went balasitic this time.
Third student :he came and just watched his women teacher.
Suddenly every student started seeing teacher as well but just below from face as third student has got right shape of his women teacher on blackboard.