Chopped liver
Chopped liver only appears in the episode Growth Spout. In that episode, the chopped liver can talk, just like that biscuit lying beside him in Mr. Krabs' cupboard. Both have apparently gone unnoticed by Mr. Krabs for sometime. The chopped liver is mostly used just as a gag, when the biscuit says "What am I, chopped liver?" The chopped liver says, "No, that's what I am."