Hamlet (Bart) utters a line to himself that is supposedly unheard by other characters and refers to it as a "soliloquy." However, the other characters are on stage at the same time. This would make the line an "aside," and not a soliloquy. (A soliloquy is an extended monologue done with the character on stage alone.) In the original play, the "conscience of the king" scene *is* a soliloquy; the fact that Moe/Claudius can hear him is parodying the fact that Hamlet should be alone.