The donut
The Talking Donut was a donut that appeared in the episode, "Ghoul Fools". The donut was shown when Lord Poltergeist put Mr. Krabs, Patrick, and, Squidward into a void. The donut attempted to annoy and aggravate Patrick by sticking on his head, every time Patrick tried to reach the donut, the donut would make his head extend, making it impossible for Patrick to reach the donut. The donut soon became annoyed when Patrick kept changing the donut's form. It loses its sanity when Patrick decides to change back to what it was in the first place.