These 2 on my mind are just about life and our universe in general. What if there was no life at all in the Universe. Nothing conscious. There would be this whole giant unimaginably big universe, and absolutely nothing to witness it, it would just be. Since the universe is not self aware, it would almost seem like it wouldn't matter whether it existed or not at that point. Since nothing would know it was there. The other one is just kind of a weird thought. What if we never developed the ability to perceive sounds with our ears? We would know there are vibrations and such around us, but we would never know such a thing as sound existed because we would have no way of imagining what a sound is. Got any?