Tear Jerker: Horrifying as he eventually becomes, poor Patrick is just devastated that his best friend is leaving him forever, and is completely hysterical until he comes home.
Memetic Mutation: "You're Squidward! He's Squidward! He's Squidward! I'm Squidward! Are there any other Squidwards that I should know about?!" Cue a cut to Gary meowing in Squidward's voice, wearing a fake bulbous nose. It's popular to take screenshots of this scene and replace "Squidward" with any character name or title that a series has multiples of.