Peanuts by Charles Schulz for February 18, 1980
Transcript:
CHARLIE BROWN: I hear you had a good time at the Valentine's Day dance, Pig-Pen... PIG-PEN: Yes, Patricia is an unusual girl..Do you know she never once criticized my appearance? PIG-PEN: I know I'm not very neat, but I can't seem to change.. SNOOPY: Not without an environmental impact report!
Unless you count the “AAUGH!” in the February 13 strip.