Hilarious! I wish I had thought up some of these responses.
My DS16 has had the existence question on and off throughout the years. He started with the "Why am I here?" when he was around 7 and then when he was 13, he became extremely upset one day and wanted to know "Why do I exist?" He didn't find much humor when I told him to "Who else would fill my life and drive me crazy occasionally" and he insisted on a proper answer. We began exploring different religons and beliefs for this one so he could draw his own conclusion. It seemed as though he could not understand it was a question many philosophers still hold.
Another time, he asked his 1st grade teacher "Do we have seeds inside us?" after they were exploring the parts of a plant. His teacher insisted that I have the "talk" with him. I quickly explained he already knew and he was just testing you. :p
