Grey Worm: Y-you are my weakness.
Missandei: That's what I am? Your weakness?
Grey Worm: When Unsullied are young, the masters learn their fears. One boy is scared of dogs, one boy hates high places, one is frightened of the ocean. They make the boy sleep with dogs or climb a cliff. They throw him in the water. If he learns to swim, good. If he drowns, good. Either way, strong Unsullied. But I had no fears. I was never the biggest, never the strongest... but I was bravest, always. Until... I meet Missandei from the Isle of Naath. Now I have fear.
Missandei: Two translators are on a sinking ship. The first says, "Do you know how to swim?" The second says, "No, but I can shout for help in 19 languages."
Tyrion Lannister: Ah! (weird laugh)
Grey Worm: That is the worst joke I ever heard.
Missandei: You don't even know what a joke is.
Grey Worm: I am soldier all my life. You think I never hear joke?
Tyrion Lannister: You lied to us.
Grey Worm: I make joke.
Grey Worm (to slaves): All men must die. But I promise you, a single day of freedom is worth more than a lifetime in chains. This one is called Grey Worm. I was taken as a baby by the Masters of Astapor, raised and trained as Unsullied. Now I fight for Daenerys, the Mother of Dragons and Breaker of Chains. There are three slaves in this city for every Master. No one can give you your freedom, brothers. If you want it, you must take it.
Daenerys Targaryen (to Unsullied): From this day forward, you will choose your own names. You will tell your fellow soldiers to do the same. Throw away your slave name. Choose the name your parents gave you, or any other. A name that gives you pride.
Grey Worm: "Grey Worm" gives me pride. It is a lucky name. The name this one was born with was cursed. That was the name he had when he was taken as a slave. But Grey Worm is the name this one had the day Daenerys Stormborn set him free.