There is a well known fact that in many areas of Michigan Stadium, Jumping up and screaming, and giving your friends a "high five" for a 10+ yard run would mean you would hear shouts of "Down in front!". I can remember the first time me and my brother did that on one of our trips up to Ann Arbor to watch a game. The awkward stares recieved by being the only two people showing a pulse anywhere other than the student section was creepy.
Here is a little gem I found on Yahoo sports dealing with the Kansas City Chiefs, and Arrow Head Stadium.
Re the new rules:
In practice, though, it might not be such a great idea, especially if the person responsible for coming up with the rules is an 85-year-old woman who teaches the 2nd grade and regards standing up as one of the evil things that young whippersnappers often do. Seriously, standing erect is the No. 2 item on the list of things that are prohibited:
• Standing and/or obstructing the view of other fans
Not only that, Pro Football Talk points out how seated fans can anonymously tattle on their upright counterparts:
The Chiefs also have set up a text-messaging system that allows fans who might be offended by behaviors like standing to report the situation to the powers-that-be.
I can see the down in front crowd salivating at the same ideas now.