WHO TV - Des Moines: Sports - Iowa Sports, Sound Off and Scores for Central Iowa, Des Moines, West Des Moines, Ames, Ankeny, Clive, Indianola, Marshalltown, Norwalk, Urbandale and Windsor Heights.
Take a quick gander at this video, about 40 seconds long. Hopefully the above address will help you find it. If it doesn't, leave a note and I'll try again.
The game is an Iowa 4A state playoff game between two metro Des Moines schools at a neutral field. The home team was Dowling, and they supplied the chain crew. While not mentioned, the exuberant 'official' is probably a member of the chain crew. I attended a game in which this crew worked as the chain crew, they were introduced as Dowling grads and they were all dressed like the officials, with the exception that the game crew wore short sleeves while the chain crew wore long sleeves.
I think if I were a linesman, and I saw this kind of response out of the chain crew, I would have a little discussion with them.