Few things bring co-nationals together like beer does. In what is only one of [many patriotic ad campaigns](http://www.youtube.com/watch?v=8gper3YkzMg), Canadian beer company **[Molson](http://en.wikipedia.org/wiki/Molson_Brewery)** has invented a beer fridge that opens only when potential drinkers sing the Canadian national anthem. Aptly titled O Canada, this contraption has Canadian nationals happily belting out their country’s song with more pride and energy than ever. If all the right notes are hit, the singers walk away with as much free beer as they can carry.