Four hockey fans are mountain climbing. Each climber happens to be a rabid fan of a different NHL team. One from Chicago, one from St. Louis, one from Detroit and the other from Nashville. As they climbed higher and higher, they argue more and more about which of them is the most loyal to their particular hockey team.
As they reach the summit, the climber from Chicago takes a running leap and throws himself off the mountain yelling ” This is for the Chicago Blackhawks!”
Not wanting to be outdone, the climber from Nashville throws himself off the mountain shouting “This is for the Nashville Predators!”
Seeing this, the St. Louis Blues fan walks to the edge and yells, “This is for hockey fans everywhere!”. He then pushes the fan from Detroit off the cliff.
(Slightly modified from a joke seen on Hockey Pundits, which involved some Canadian teams or something.)