"Adventure Time" Quote Sighting

The Magician's Land is the third book in Lev Grossman's New York Times bestselling books about the young magician Quentin Coldwater's adventures in the magical land of Fillory, an alternate world reported on Earth as a series of beloved children's books. As well as references to Narnia, Middle Earth, the Harry Potter books ("Dumb-Bell-Door!"), and Alice in Wonderland, you can find this bit, where a character named Josh is trying to catch the ram-god Umber:

She was still standing there, arms crossed, glaring at it, when Josh came heaving up the top step like he was trying to get himself out of a swimming pool.

"I'm gonna sack that guy's nutcastle," he croaked.

This is surely a specific reference to this exchange in the Adventure Time Season One episode "Henchman":


Lisby: Yeeees? Duke and Duchess of Nuts' residence!
Finn: My boss is gonna sack your castle!
Lisby: Oh! Well, that's certainly bad news for us!
Duke of Nuts: Lisby! Who's at the door?
Lisby: Someone who wishes to sack the nut castle!
Duke of Nuts: Why would you want to sack my nut castle on my second son's first birthday?!

A lovely little example of the Easter eggs Grossman habitually leaves for all lovers of Fantasy.