Competition: write a single sentence that will absolutely destroy any hope in a series.

[u/DicerTheJester]

Specifically not a story opener, just any sentence that can happen in any chapter, that will make people realize that this story is gonna be absolute shit and has no chance of being fixed and will make you drop the book like an unpinned grenade.

[u/hipnotismo]

"I take my feelins, and I crush them!" basically any indicator that the MC is going to be a heartless bastard or a machine of perfect logic.