The groceries truck crashing into the Dome and folding like paper.
Duke's pacemaker exploding out of his chest.
Junior kidnapping Angie and locking her in his bomb shelter because he thought her dumping him was because 'the Dome made her sick'.
A woman happens to be reaching across the line when the dome comes down. She loses her arm.
In the first episode, a cow gets sliced in half by the dome. We get a glorious show of its insides.
Joe comes across an apparent picnic spot that the dome fell over. There's a pair of disembodied legs on inner side, and a blood trail leading away on the other, indicating that whatever poor fellow was picnicking tried to crawl away.
MOAB (aka The Mother Of All Bombs) being launched against Chester's Mill in 'Visitor's Day'.
In episode 4, Joe and Norrie contrive to make a video recording of their own seizures. When they watch the video afterwards, we see Joe sit up, look directly into the camera, and make a shushing motion— and the expression on his face is unbelievably creepy.
Rose's murder and Angie's almost-rape in 'The Endless Thirst'.
The Four Hands's Dome-induced vision of Big Jim calmly standing as he starts to bleed from knife wounds, with the bloody knives in their Dome-free hands.
BigJim throughout the first season, but especially once from 'Speak Of The Devil' onwards.
For that matter, the velocity with which most of the townspeople blindly believe Big Jim's lies.
In Season 2, a science teacher, Rebecca, wants to commit mass murder by releasing a weaponized flu virus.
Linda's death and Angie's murder in 'Heads Will Roll' (in which ironically, neither of the victims is decapitated).
The whole fire under the Dome sequence. And Henry's bus. Also the last few minutes of Jim Rennie's life: alone in the dark, with a failing heart, running out of air, surrounded by the ghosts of his victims...
You're reading this book. You turn the page/pressing the kindle screen. You see the title of the next chapter: BLOOD EVERYWHERE.