Monkey and hunter
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"The Monkey and the Hunter" is a thought experiment often used to illustrate the effect of gravity on projectile motion.
The Story
A hunter with a blowgun goes out in the woods to hunt for monkeys. He sees one hanging from a tree. He knows that a monkey will always drop from its branch the moment a hunter fires his dart. How does the hunter aim his gun to make sure he hits the monkey?
Experiment purpose
Demonstration of all objects experiencing gravitional pull and the need of aiming a projectile at a falling target is just the same as you would aim at a stationary target.
Experiment videos
http://www.waowen.screaming.net/revision/force&motion/mandh.htm (source: http://www.ap.stmarys.ca/demos/content/mechanics/monkey_and_hunter/monkey_and_hunter.html)