[gruez]

considering people aren't making bottles/cans to game beverage container deposit programs, I don't think it's going to be that big of an issue.

[pintxo]

One guy [1] manipulated a bottle return machine to get a cash out of some 40,000€. He prevented the machine from shredding the bottle, so he could return it 180,000 times.

[1] (German only) http://www.spiegel.de/panorama/justiz/koeln-betrueger-erbeut...