http://tvtropes.org/pmwiki/pmwiki.php/TearJerker/SevenDaysInSunnyJune
This is based on opinion. Please don't list it on a work's trope example list.
Following
Tear Jerker /
Seven Days in Sunny June
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Book I
- Minuette's suicide attempt.
Book II
- The moment Applejack goes to her parents' graves, explaining to Sunset all that's occurred.
A Mother's Duty
- Celestia's anguish over her fears of losing Sunset.
Book V
- The deaths of Lotus Garden (and later, Softspoken) cause Everblue Sky to abandon his daughters Adagio, Aria and Sonata.