Transcript:
Charlie Brown and Violet are wading through the water. She says,"This water's too cold for wading..."
She shudders and continues,"My feet are freezing!" "Brrr..."
She sits on the sand warming up her feet and putting on her shoes. She looks at Charlie Brown standing in the water smiling and asks,"How can you stand it, Charlie Brown?"
He lifts his shoe clad foot out of the water and replies,"I've still got my shoes on!"
Original comic:
I would guess that's part of the joke. Kids thinking in the now, and not about consequences