I Love Lisa
The Simpsons: Season 4, Episode 15
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Valentine's Day comes to Springfield and Lisa takes pity on Ralph and gives him a card, but when Ralph falls in love with Lisa their friendship turns bad, causing a bitter feud to break out between the two families.
Show: The Simpsons
Air date: February 11, 1993
Chalkboard gag: "I will not call the principal "spud head""
Couch gag: The family and various circus performers form a kickline, turning the living room into a circus extravaganza.
Episode no: Season 4; Episode 15
Written by: Frank Mula