One of the more inexplicable unwritten rules of sports is the one that says that when a team is playing for a championship, someone from the team or school must have pre-ordered some caps and/or t-shirts that declares them the champs, and then they will force the players to wear it within 30 seconds after the clock has ticked down to 0:00.
Caps are worse, because you can't recognize the individual players on TV when they wear the cap. But the t-shirts are bad because the losing team has those shirts that nobody will ever wear. Sure, they tell you they donate them to homeless shelters, but have you ever seen a homeless person wearing a "Philadelphia Eagles--Super Bowl XXXIX Champions" t-shirt? Ever?