I didn't know this and I'm going to post it without digging through a billion GOT pages on CP:
HBO: Have you planted any Easter eggs in the show?
David Peterson: One of the biggest is from
Episode 3 this season. There's a scene where the Meereenese rider is challenging Daenerys' champion. He's shouting and Nathalie Emmanuel [Missandei] is translating – but she's not translating what he's saying. He's actually saying a Low Valyrian translation of the French guy's insults in 'Monty Python and the Holy Grail.' That was [series creator] Dan Weiss's idea and it was so hilarious that I had to do it.
HBO: Have fans caught on?
David Peterson: They know that something's going on. Right after that episode aired, I was getting
tweets like, "Is he saying a 'your momma' joke?" Close… But no, he's actually starting out with, "Your mother is a hamster."
http://www.makinggameofthrones.com/p...david-peterson