NFL fans are an intense bunch. Of course, when your team only plays 16 games a year, every game can seem like a must-win, so it makes sense.
When you get that invested in a team, you start to believe that you have the power to actually effect what goes on. You know it's crazy deep down, but at the same time, you still kind of believe it.
If you believe in these upcoming superstitions, you should probably seek help immediately. Unless you're a New York Giants fan, because whatever you're doing is clearly working.