My student Maria introduced me to the the Silent Disco the other day (well, she showed me the site, unfortunately we didn't find one nearby). Pioneered at clubs which did not have permission for loud music, silent discos pass out headphones to dancers who listen to music sent out via radio. See CNN or this Youtube video:

So what are the strangest manifestations of network culture that you've seen? Please, comment away! Your chance to be famous for a day (yeah, right).