Security was so tight on the Game of Thrones set that no one was allowed to refer to Jon Snow on set. His name didn't appear anywhere in the scripts, call sheets, or prop and wardrobe materials. In fact, there was a team of HBO snipers covertly stationed on set -- and in every pub in Belfast -- to take out anyone who even thought about saying the name "Jon Snow." (OK, so maybe security wasn't that intense, but you get the point!)
However, not all cast members played by the rules. While shooting Jon Snow's top-secret resurrection scene, Carice van Houten (Melisandre) gave Harington a new "LC"-based nomenclature. EW wouldn't reveal the nickname because it wasn't fit to print (hmmm), but that got us thinking: What other "LC" moniker could we give Jon Snow?
Sorry, buddy. You know it's true.