What's the deal with Woody the Beer Skull?

Well... Let's see....  We all have our own superstitions (whether we like to admit it or not) and I, too, have mine.  On brewdays I wear my lucky socks and sweatshirt.  My darling wife almost threw out my lucky sweatshirt because she thought it was too ratty.  Anyway, years ago, one of my kids (Alex, I think) got a little plastic ring shaped like a skull while out Halloween trick-or-treating.  Alex was playing with the ring outside while I was assembling my RIMS system for it's first batch. He put the ring down and I figured that it would get lost and there would be problems (you know kids), so I put the ring on the outlet of my pump on the line that goes to my fermenter or CF heat exchanger.  He's been there ever since and just about every batch of beer that the system has produced has passed by Woody.  I'm not one to mess with what has been working well so Woody stays.