If a tree falls...
If a tree falls in the woods and no one is around to hear it, does it make a sound? Now, the answer I hear all too often is "Yes, it still causes vibrations whether or not someone is around to hear it."

First of all, that is a belief. It's blind faith. You believe it still causes vibrations, yadda yadda yadda. If no one's around to hear it, did it fall? If you walk into the woods and see a tree laying on the ground, you jump to the conclusion that it fell; but really all you know is that it's laying on the ground. It is a question of perception. Does something exist if nothing perceives it?

Second of all, the question isn't "does it vibrate?" The question is "does it make a sound?" If no one is around to hear it, how can you say it makes a sound? If there were no such thing as ears, nothing would make a sound, but things would still vibrate.

Anyway, there's no answer to the question. That is the point.