Four Major League Baseball fans went rock climbing: a Yankee fan, a Red Sox fan, a Cubs fan, and a Cardinal fan. They had been arguing all the way up the mountain about who amongst them loved their team more and was the most "diehard" fan.

The argument grew hotter and hotter and the four fans grew more and more agitated. Such was the emotion that upon reaching the top of the mountain, the Yankee fan proclaimed loudly and earnestly to the other three, "This is for the New York Yankees!" and without a moments hesitation threw himself off the mountain. The supreme sacrifice!

Not to be outdone by a Yankee fan, the Red Sox fan jumped up and cried out, "This is for the Boston Red Sox!" and quickly threw himself off the mountain, also willing to sacrifice himself to prove his devotion to his team.

Refusing to be outdone by the Yankee and Red Sox fans, the Cubs fan rose to his feet, summoned up every ounce of his courage, and yelled at the top of his lungs, "This is for the Chicago Cubs!" and without a moment's hesitation, shoved the Cardinals fan off the mountain.