From my friend Zo's blog:
The scenario: You are in the Middle East, and there is a huge flood in progress. You're a freelance photographer for a news service, looking for particularly poignant scenes to shoot. You come across Osama Bin Laden who has been swept away by the floodwaters. He is barely hanging on to a tree limb and is about to go under. You have to make a choice. You can either put down your camera and save him, or take a Pulitzer Prize winning photograph of him as he loses his grip on the limb.
So, here's the question...and think carefully before you answer it:
Which lens and shutter speed would you use?