After having spent the entire film very cautious of his scissors and the narrative using them for (mostly) comedic purpose, it's a mixture of this and Nightmare Fuel when Edward for the first time intentionally uses them to hurt someone by killing Jim. And dear lord is it satisfying.
Kim gets one in the climax too:
Kim: (holding one of Edward's fallen scissors to his throat) Stop it, or I'll kill you myself!
In a meta sense, the scissor hands themselves. After watching the film, you'll know why their designer got a credit in the opening titles.