the teacher assigned Kaveh in a role of a person in maternity for the play

a young girl is supposed to play the role, but she had a flight and couldn't attend the play (she made it up so she doesn't have to own the role)

Alhaitham's the father/businessman. They both walked on the stage

Kaveh: he whispers "This is so stupid..."

Alhaitham: he sighed "Sorry. You have to do it."

the rehearsal begins, everyone is trying to hold their laughter

Kaveh: "Oh, dear.. My back hurts-" he groaned, dramatically

you walk into the stage, your role is their kid. You are sooo embarrassed that you have to wear dumb pajamas