Love Notes for Muffy is the first part of the sixteenth episode of Arthur season 2. Love Notes for Muffy aired on March 16, 1998. It aired with the episode "D.W. Blows the Whistle".
The Brain and Francine use fake love notes to get vengeance against Muffy after her science project gets more credit. Their joke has unintended consequences and they must fix it before things get worse.