It could be that the mom was trying to keep the kid quiet so as not to disturb others in the cartoon scene. Or perhaps the kid was making a commotion at an inappropriate time.
It could be that the mom is having a bad day and is taking it out on the kid. Or perhaps the kid didn't follow the rules and the mom is trying to teach a lesson.
Maybe the kid did something naughty or broke a rule that mom didn't like.
It could be that dinner is ready, or the weather outside is turning bad. So, the mom wants the kid to come in. Also, perhaps the kid has been out for too long and it's time to rest.
Maybe the kid has been up too late and needs to get enough sleep for the next day.
Maybe the kid is in trouble or wants something urgently.
It could be that the kid had a great day and is sharing the joy with mom by hugging her. Or perhaps the kid had a bad experience and needs mom's reassurance.
It could be that the mom said something that upset the kid, or maybe the kid is frustrated about something and taking it out on mom. There are many possible reasons.
It could be that the comic is trying to show a realistic situation where kids pick up bad language. Or perhaps it's used for shock value or to create a specific plot point.
Maybe the kid did something naughty or disobedient that made the mom lose her temper.
It could be a mysterious or quiet style. Maybe it aims to create a sense of suspense or secrecy.