The self-immolation of Thich Quang Duc never fails to amaze me. It's just unreal.

And Antonio Turok's photograph of the 1991 total eclipse of the sun in Chiapas, Mexico. This one because even when I know what an eclipse is and how does it happen, there's a moment in my head when I think "What if it never ends? What if everything stays like this forever?" I see that instant of terror in this photo.