Following illogical superstitions
You may be an atheist. You may laugh at people stopping after a black cat has crossed their paths. You may diss ones who believe that a broken glass brings bad luck. But, all logic goes out of the window on the day of your favourite team's match, when every fan turns into a believer.
Wearing a dirty, unwashed, old jersey to every match, sitting/standing at a particular place at a particular degree from the TV or eating the same meal before a match every single time are just a few examples of the superstitions fans follow in the hope that these would help their teams win.
How a pair of socks or a band can alter the team's fortunes is an unanswered question (and of course, illogical), but it continues, and will continue to be one of the most prominent practices related to sports.