Bladderwort
Despite their small size, the traps are extremely sophisticated. In aquatic species, prey brush against trigger hairs connected to the trapdoor. The bladder, when "set", is under negative pressure: when the trapdoor is triggered, the prey, with the water around it, is sucked into the bladder. Once the bladder is full of water, the door closes again. The whole process takes only ten to fifteen thousandths of a second.