Given the lack of punctuation at the end of the sentence compared to proper punctuation on the other lines, I would expect that one of these is true:
- The end of the punchline was never printed.
- The end of the punchline appears elsewhere and cannot be seen because of how it is being held.
- The image has been edited for comedic effect (successfully, in my opinion).
Have a snack ready when they get home from school. Make it reasonably healthy but it should be something they like. Keeping their blood sugar up at the end of the day makes evenings so much more pleasant.