From Northwestern’s wikipedia entry:
Northwestern has several traditions for football games. Students perform the Wildcat Growl when opposing teams control the ball, while making “claws” with their hands. Also, students jingle their keys at the beginning of each kickoff, to symbolize that even if Northwestern loses on the field, graduates of other schools will park students’ cars in the future.
First, you know, this is pretty obnoxious. But, second, isn’t jingling keys during the kickoff a pretty common thing at college football games? I guess I had never granted any larger meaning to it, other than creating anticipation for the start.