Transformers: The Movie/Nightmare Fuel

• Unicron. Not only do we get to watch him devour an entire planet within the first few minutes of the film, children and all, but later we even get a charming trip through his innards that includes shredding claws on tentacles and a giant bath of acid his victims are dumped in. The latter actually shown in action with victims struggling and flailing as they melt. Watch it here.
• Starscream's death. He gets zapped by Galvatron. Not good enough? Okay, how about watching his lifeless remains crumbling to dust? And this comes directly after an amusing scene where Starscream shoots the trumpets of some of his subordinates to get them to stop interrupting his speech.
• Prowl being shot by Scavenger in cold blood would normally just qualify for Nightmare Fuel. But the fact that we go close-up on his eyes glowing red and smoke pouring out of his mouth before he collapses...
• Imagine this: You're a young child who has watched Transformers for years. Imagine the horror on their face when almost every character they grew to love is killed by Megatron on the big screen. To sell toys.
• You'd think a world-gobbling planet is scary? Wait a fucking second, DID IT JUST TRANSFORM INTO A GOD!?!?! Yes, Galvatron, we feel how scared you are. Even worse is that, unlike the real God, Primus was DECIMATED by Unicron. That gives you an idea of his power and how utterly screwed we would've been if Rodimus Prime hadn't been able to open the Matrix.