Mike Szczys went all out this Halloween and installed a matrix of 70 LEDs in a pumpkin! The result is a way to scroll messages in the dark for visitors and trick-or-treaters. See a video of the Jack-o-Lantern in action, and the complete process of building it at Hack a Day. Link -Thanks, Mike!
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Many parasites have crazy reproductive cycles like this. I recently read "Parasite Rex" by Carl Zimmer where he describes many strange parasitic species and their big and often underestimated influence on many ecosystems - quite an interesting book!
http://blogs.discovermagazine.com/loom/