You should always do favors for others.
Lenny is relaxing at home about to watch a movie when his friend Norbert asks him to come babysit for him in an emergency.
Lenny wants to answer Norbert's call for help.
Lenny tells Norbert he can watch the movie at his house with his kids and watch them that way, so he'll be right over.
Lenny tells Norbert that he was just about to watch a movie, so he's busy and Norbert should find someone else.
Norbert thinks that's a great idea and is glad his friend will help him.
Norbert is annoyed that Lenny thinks watching a movie means he's busy and is angry his friend won't help him.