Use the same cup dude...
I don't really have a ritual but we're (my wife and I) pretty superstitious. Here are a few :
1.) The best man in my wedding is banned from inviting us over on Saturdays in the fall, since we lost two games while watching games at this house.
2.) I bought a new 70'' TV for my man cave and the first game we watched on it was the VT game last year, we never watched another game on it.