I was trying to explain Wittgenstein to a friend using the "if a tree falls in the woods..." question. I suggested that it depends entirely on what you refer to as "sound": vibration or sensation. The person I was talking with insisted that no, only a narcissist would assume it wouldn't make a sound just because there is nobody there to hear it. What about the birds, he asked. First of all, is my use of the tree falling conundrum an appropriate way to introduce someone to Wittgenstein? Was I perverting Philosophical Investigations? What would have been a better way to get across the importance of Wittgenstein in this case?