The string breaks, it goes into the machine, makes a short circuit, all the cans of the machine are thrown at you; one gets blocked, it blocks the other ones, that creates an enormous amount of pressure, the inner pipes breaks under the pressure, the cooling liquid runs on the soda, creating acid; the acid makes a hole down the machine and digs into the ground, a prehistoric oil stock is now coming to the surface, a spark lights it and a great fireball comes out; the heat created by it makes the aluminium unstable, it decays into aluminium 39, the isotope enters in supra-fusion and makes polonium 210 (jumping 71 elements); the polonium gets in fission and blow your city up...