Surely you've heard the oft-repeated cliche that the word "fan," as it pertains to sports, is short for "fanatic."
So it's no surprise that fans often engage in fanatical behavior. Fanatical fans run the gamut of crazy.
On the lesser end of the fanatical behavior scale, you have excessive (but acceptable) behavior such as massive memorabilia collections, horrifyingly stupid tattoos and outrageous, but legal, celebrations.
On the more extreme end of fanatical behavior, you have your stalkers, your field-chargers and your murderous psychopaths.
Here are 50 of the craziest sports fans ever!