Jockey Box Foam

So the question was, why does the beer come out so foamy from my jockey box? My instant response was the keg may have been shaken or jolted during transpost? This link may provide some help

http://www.homebrewtalk.com/f51/jockey-box-makes-my-beer-super-foamy-327776/

http://www.tastybrew.com/forum/thread/68073

http://www.kegworks.com/blog/2010/08/18/jockey-box-tips-from-a-kegworks-customer/