It's nice not to disturb someone.
Joey sees that his Mother Mary is on a phone call, but wants to ask if he can go out to play.
Joey wants to ask his question.
Joey decides to wait until Mary finishes her call to ask if he can go out to play.
Joey decides to talk over Mary's conversation and ask if he can go outside.
Mary is proud of Joey for being patient and tells him he can go.
Mary gets angry and tells Joey no because he interrupted her phone call.