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Transcript:

Charlie Brown stands over Schroeder sitting on the ground slurping on his thumb. The former says,"You shouldn't suck your thumb, Schroeder..."

He continues,"It might make your teeth crooked..." Schroeder continues sucking his thumb.

He crouches in front of Schroeder and says,"Or spoil the shape of your mouth..." Schroeder continues sucking.

Charlie Brown sits on the floor, looks at the reader, and sucks his thumb. He concludes,"Besides that....it's catching!"

Original comic: