And yes, I made up the %. I've been around kids FOREVER and NO 6 year olds have ever talked about the rivalry game. NONE in 25 years. ZERO. 

*Neighors (and my former neighber in Murray was a UU lineman with two sons that played with my kids), none in 15 years of coaching the younger ages (with the exception of this year — again, not 6 years old). None even during my cub scout time (kids 8 years up). I've only recently heard things from YMs — but they are usually in upper middle school....