I know of a few, but I've never tried them. Let's see:
Someone has told me that you can ruin a vending machine by pouring saltwater down the coin slot. An easy way to get 12 cokes as well..
Another is to keep all your burnt-out light bulbs. At night, get to the second story of any building and throw them down onto the pavement. They should make a good flash. I can't promise these 2 will work, but I believe they should.
I used to work at a sign shop; one day we scanned the face of a quarter into the computer then processed it through on shiny vinyl. We cut them out and put them on the ground outside the store. I don't think anyone was ever fooled into picking one up though..
At the end of sophomore year, I was planning on gluing quarters at the base of a soda machine. I never got around to it..
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