In Supernatural, when Dean was killed by a nail after FIFTEEN seasons of fighting demons, Death, and God himself.
2
On Orange Is the New Black, when Tiffany overdosed falsely thinking she'd failed her GED.
3
In Buffy the Vampire Slayer, when Anya died of a stab wound at Sunnydale High in the series finale.
4
On Game of Thrones, when Jon stabbed Daenerys.
5
On Pretty Little Liars, when Maya died offscreen — and it turned out she hadn't even been killed by any of the main villains, but by some guest star stalker who had absolutely nothing to do with the main plot.
6
When Wren was revealed to have died offscreen.
7
On The 100, when Bellamy was shot dead by Clarke.
8
On True Blood, when Tara was killed offscreen:
9
On How I Met Your Mother, when Tracy was revealed to have died in the finale and it turned out the whole show was a buildup to Ted and Robin being together.
10
On Angel, when Fred died in a single episode after being struck ill with the spirit of Illyria
11
In Glass, when David Dunn/The Overseer — a superhuman — was drowned in a flooded pothole.
12
In Star Wars: Episode VIII – The Last Jedi: when Luke died by depleting his life force through astral projection.
13
On The Vampire Diaries, when Damon killed Tyler while under Sybil's control
14
On Angel, when Cordelia died offscreen in a hospital after spending half a season in a coma (which none of the main characters even visited her during)
15
Lupin and Tonks in Harry Potter 7.
16
Lavender's fate.
17
The kids' babysitter Zara killed in a brutal minute-long sequence in Jurassic World.
18
"In Star Wars: Episode III – Revenge of the Sith, when Padmé died of a broken heart despite having two children who needed her and expressing that she still had hope for Anakin"
19
In Avengers: Endgame, when Natasha sacrificed herself for the soul stone
20
In The Hunger Games: Catching Fire Part 2, when Finnick was killed by lizard-thingies after surviving not one, but TWO Hunger Games.