Transcript:

Charlie Brown walks down the hallway shouting,“Patty!”

He walks through the living-room and shouts,“Patty!!”

He stands by the curtains and continues,“Patty! Oh, pardon me…”

He looks down at Patty sitting reading to Snoopy, who is frowing at him. Charlie Brown concludes,“I thought you were alone!”

The first time Charlie Brown’s signature zig-zag shirt is shown with a V-neck

The gag is recycled from the Li’l Folks strip from August 24, 1947: