Step 10: Done
-Install it in a fake hanging plant instead of a pumpkin pail to make the spider even more unexpected
-Replace the motor in this circuit with a relay to power a much bigger motor, wind a couple of bungee cables and drop a prop the size of a basket ball.
-Use the simple motor control circuit for other props, like a rattle snake that shakes it's tail when people walk by.
This is one of my first Instructables, so if anything is unclear let me know and I will update it.
Hope you have fun with this little piece of Halloween tech! If anyone builds this I would love to see pictures, especially if you make a version with a wooden enclosure or another variation.