"Straight Outta Abalathia" (Mor Dhona sidequest) was almost too much for me (of course, referring to "Straight Outta Compton" by NWA).

"Them" (Eastern La Noscea FATE), referring to the obscure horror movie of the same name.

"What's on Your Mind" (Coerthas FATE, whose enemies are called Pure Energy), referring to the song by Information Society