Simpsons episode: What did Lisa say in this episode?

Question

I refer to an episode of the Simpsons where Lisa refers to the ancient Chiese question about: If a tree falls in the forest and there is nobody there to hear it does it make a sound? She answers this by referring to the ancient Chinese explanation, explaining it is not about the tree and the forest but explaining a wise Chinese take on life. Does anyone who knows of this episode remember exactly how Lisa explains this, I can't find the true meaning of this proverb anywhere but remember her explanation was perfect. Thanks

Answer 1

"But Bart, how can sound exist if there's no one around to hear it?"  oddly enough i just saw this episode a few days ago.

Answer 2

You're talking about the episode called "Dead Putting Society" from Season 2.

Here is what Lisa says:

"How can sound exist if there's no one there to hear it?"