dracula's graveyard

Episode: “Graveyard Shift," Season 2, Episode 36a

Reference: 1922 German Expressionist horror film, “Nosferatu.” Nosferatu is shown at the end of this episode as an explanation of lights flickering on and off at the Krusty Krab. 

This is a rare instance of a more direct pop culture reference from Spongebob, albeit somewhat obscure when considering the age of the average viewer.