Perhaps the kid saw or heard something that made sense to them, and that triggered them to say 'I get it'. It could be as simple as understanding a joke or realizing how to play a game.
Maybe the kid understood something that was explained to them and that's why they said it.
Maybe he's agreeing to something fun or exciting that was offered to him.
The reason could be that the presents got lost in delivery. Or maybe the kid had expectations that were too high and didn't appreciate what they did receive.
Maybe the kid did something naughty or broke a rule that mom didn't like.
Maybe she's giving some advice or sharing a funny story.
Maybe the cartoon's behavior or appearance scared the kid, making others take the opportunity to bully.
Maybe it was part of a Halloween-themed story and the carving was for fun or decoration.
Maybe the kid wants to help someone or is looking for something specific.
Maybe it was an accident or part of a funny plot twist.
Maybe it's a funny plot twist the cartoon creators came up with to make the story more interesting.
Maybe he doesn't like what's happening or doesn't agree with something.