I think it’s either “Charlie Brown discovers something basic that amazes him” because he’s 4 years old in these early strips, or “He’s been confusing cats and rats in some written context” like “Beware Of Cat” or “Danger: Rat Poison”.
Either way, not his best strip, but they can’t all be zingers.
ELI5?
I was thinking it was sarcasm
I think it’s either “Charlie Brown discovers something basic that amazes him” because he’s 4 years old in these early strips, or “He’s been confusing cats and rats in some written context” like “Beware Of Cat” or “Danger: Rat Poison”.
Either way, not his best strip, but they can’t all be zingers.
Could also be “those words sound similar, are they also spelled similarly?”
Regardless I think the joke was “Remember when your worries were so innocent and minor?”