A missing lunch. An empty milk carton. Two feuding households and a thoroughly avoidable tragedy. Not every complaint needs Mercutio’s level of commitment, but “A plague on both your houses” does make a satisfying alternative to a passive-aggressive note.
Taken from Act 3 of Romeo and Juliet, the line gives this fridge magnet its dramatic credentials, with flowers and poison bottles completing the design. A small tribute to a character who could deliver a devastating line even when the situation was, frankly, deteriorating.