3M recently completed an amazing poster-stunt in Vancouver, Canada. They prepped a bus shelter ad with a 3M product called Scotchshield, a see-through film that you can apply to glass which makes it near bulletproof, and filled the postersite with lots of play money, and 500 real Canadian dollars for good measure. As passers by did their best to put the Scotchshield to the test, kicking the glass, taking sledgehammers to the glass and going all sorts of crazy over it, the glass withstood the pressures and did not budge. It did not break, it could not be broken