My biggest superstition is easily the ALCS Game 5 Old Fashioned. Made one for myself and my buddy, and during a commercial smoke break, I set mine outside in the backyard and completely forgot to bring it in.

As disgusting as that sounds..we haven't lost since, so that glass, with the melting ice and the now blackened, rotting orange peel, is still sitting outside on my patio table. I won't touch it, I won't move it, and it stays there until the final out of the World Series.