My Eight-Year-Old Begins Dipping Into Philosophy and Semantics

Son: Do you think a cat's meow is a nice sound?
Me:  Sure. Most of the time. 
Son: Yeah, I think its nice, too, but what if the cat is actually saying something not nice?
Me:  What do you mean?
Son: Well, we hear a meow and we think it sounds nice, but maybe when a cat meows, it's actually saying something "Aaaarghhhhh!"