In episode 269 of Naruto, while fighting Kinkaku and Ginkaku, Daru got sucked into the Benihisago. I thought you could only be sucked in if you said your most said word or if you remained silent. Darui did neither, but was sucked in after he said "I'm the Boss' right arm. I'm no imitation!" Does this sound like his most said word, "dull," in Japanese?
Taken from the Naruto wiki, 'he inadvertently uttered the word when he admonished the brothers and stated, "Ore wa Bosu no migiude da. Ruijihin janē! (「オレはボスの右腕だ。類似品じゃねェ!」, I'm the Boss' right arm. I'm no imitation!)"'. "Daru" sounds like his most said word, "darui." This is why he was sealed.