The assassin bug (Stenolemus bituberus) is a spider-hunter that uses a long rostrum to inject a lethal saliva that liquefies the insides of the prey, which are then sucked out. Sometimes, it simply sneaks up to spiders on their own webs before striking, plunging its dagger-like mouthparts into its prey.
But it also has a subtler technique. Sitting on a web of a spider, it plucks the threads with its legs to the frequency of struggling prey, which are an irresistible draw to the spider. Witness below as an Assassin Bug hits a spider web to entice it to it’s own death: