Superstition is defined as "a belief or notion, not based on reason or knowledge, in or of the ominous significance of a particular thing, circumstance, proceeding, or the like."
Sports are built on superstitions. They're the belief that something is going to happen just because something else is happening. It's the reason Wade Boggs ate fried chicken before every single game, why hockey players aren't supposed to touch or hoist a conference championship trophy, and why Michael Jordan always wore his UNC shorts under his basketball uniform.
Fans, too, are victim to superstitions. Take me for instance.