The singing of the National Anthem is common-place at all major sporting events. What isn't as common is when the 'singer' gets taken over by the crowd. That's exactly what happened at the first Boston Bruins home game since the Boston Marathon bombing.

Before the Bruins took the ice to take on the Buffalo Sabres, the national anthem was being sung then all of the sudden the crowd took over.

Warning: this will give you goosebumps and make your proud to be an American.