Hex Machina

Bad Ex Machina.

The negative version of Ex Machina: instead of helping characters with the abrupt appearance of something or someone to the scene, it prevents these characters from completing a very crucial task to the story, such as knowing how to get out of a labyrinth or what magical concoction would kill a monster that's hunting them down. A common instance of this UnTrash playing is when someone is reading a passage (usually important instructions) aloud, then as they reach the word "is", "are", or "by" of said passage, they get cut off by a Hex Machina, keeping them from continuing reading their instructions. It's now up to this person to Figure It Out alone at a later time.