Good Yankee-RedSox fan joke from reddit:
A yankees fan and two red sox fans walk down a street..
They see a dead, nude, woman in a ditch. The Red Sox fans both take the hats off of their heads and cover the woman's breasts. The Yankees fan does the same over her privates and they call the police. The cop shows up, walks over and lifts the hat over her left breast with his pen and writes in his notebook. He then lifts the hat over her right breast and writes in his notebook. He then walks down and lifts the hat over her privates and writes in his book, gets a confused look on his face, then uses his pen again to lift it up and look, then writes in his book again. One of the Red Sox fans starting to think the cop might be perveted says, "Everything okay under there?" The cop looks back and says, "Yeah I just got confused. Normally when I look under a Yankees hat I see a prick."