Honestly, I never got the reason why professional sports teams attempted to try and teach fans how to behave or act at games. It always comes off as weird or alienating the hard core fans.
Recently, the St. Louis Rams released a series of rules in the below video called, "Ram Rules" to help the confused fan learn how to do the proper cheers and well, I don't even need to split the difference on this one, "Slow Clap It Out!":
(Courtesy of Larry Brown Sports)