Oldie but good one.
A Penn State fan, a Michigan fan, and an OSU fan are climbing a mountain and arguing about who loves their team the most. The Penn State fan insists that he is most loyal and then yells, "This is for Happy Valley!" and jumps off the mountain. Not to be out done, The OSU fan next professes his love for his team. He screams,"This is for the Buckeyes!" and pushes the Michigan fan off the mountain.