Weapons’ ending explains everything you actually need to know

But more importantly, Weapons has what every horror hit needs: a lot of effective, unexpected, sharp shocks, imagery that gets under your skin and sticks there like a thorn, and an ending that will leave people talking, interpreting, and even arguing. Cregger doesn’t stint on answering the questions that first trailer asked: Why did 17 children from the same third-grade classroom all leave their beds in the middle of the night and disappear? Where did they go? What happened to them? But his script leaves plenty of small mysteries for viewers to wonder about and argue over, and the movie ends in a place that seems designed to rankle anyone who can’t handle ambiguity.