As in life, in the sports world everything is always coming and going. That's just the natural order of things and there's nothing anyone can do to stop it. So if you're one of those people that are irrationally adverse to change, professional sports can be a frustrating beast.
Franchises are often relocated or are created out of thin air through league expansion. Players are drafted into the league each year as another class of players are ushered into retirement. Uniforms are in constant flux; colors, cut and even the company who manufactures them.
Sometimes what's old becomes new again, as in the case of the NFL throwback uniform. But many people, things and practices in sports are retired, never to be seen again. Here are 20 things in sports you'll never see again.