That song the Bandit's sing sometimes when you listen to them... not sure what it is called but some of them are quite funny, others not so much [some of them sing it without the laughter and it sounds so solemn]...
When you decide to try the Storm Call shout while having a follower along. You start enjoying how awesome it is, until you realize that Farkas doesn't like being hit by lightning, and most likely it's why he is coming after you with his sword drawn, looking mad...