>>18002118 (OP)
It's stupid on the surface but profound when you actually try to be meticulous. Here's what's going on in the head of an average person when formulating an answer
>there is an objective world out there and a subjective world in my head
>sound is a word in my head for a vibration out in the objective world
>I think the objective world behaves the same regardless of my presence
>>>>Conclusion: a falling tree make a sound regardless of an audience
Each of the points before the conclusion is assumed more or less as a matter of dogma. The subject-object separation and the correspondence theory of truth are like the immaculate conception and the transforming of wine into the blood of Christ back in medieval times - generally assumed to be the case but nobody can exactly tell you why, they can only tell you that believing the premises yielded satisfying results.
The tree question isn't there to point out that you're wrong to believe these things, just that these premises went unreflected and that there is a way of thinking about phenomena, such as sound, in a more participatory way rather than in a strict subjective-objective divide. But then again, you could just as well have asked "does it smell when a stone farts in space?"