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hard to say. it often depends on the moment. sometimes it's a really relaxing, beautiful song, sometimes it's a heart-warming or inspirational story or video. nothing is really jumping to mind right now, as it usually just happens.
http://vimeo.com/m/35396305 and http://www.youtube.com/watch?v=6cDT2vWNOnY The song is what does it, also whenever people are patriotic such as the ending of the star spangled banner at an MLB game or something. +k for embed