I had the pleasure of attending Harry Soo's BBQ Pitmaster class in Alameda, CA last February. During the class, Harry mixed up a huge batch of Slap Yo' Daddy All-Purpose BBQ Rub and used it on some of the meats cooked that day. At the end of class, he divided the leftover rub into ZipLoc bags and sent each of us home with some.
I used most of that rub on various things and really liked it a lot. When I had just a few teaspoons left, I mixed up a new batch using the recipe from Harry's class and I dropped in those remaining teaspoons of old rub. As I stirred it all together, I felt like I was infusing that new batch of rub with the BBQ love of Harry Soo and the wonderful memories of that class.
And here's where the superstition part comes into play...every time I make a new batch of SYD rub, I follow that same process. I add in the last few teaspoons from the previous batch, thinking that as long as I do that, some portion of the original rub will be carried forward into the new batch. I can't stop doing it.
Am I crazy? Wait, don't answer that. But tell me this...do you have any barbecue superstitions you're willing to share?