some guys driving around blaring what sounds like a train horn on their car.
http://videos.streetfire.net/Player.aspx?fileid=DAFBBF1C-7796-4D17-AE4A-59455DA39AD4&p=0
http://videos.streetfire.net/Player.aspx?fileid=DAFBBF1C-7796-4D17-AE4A-59455DA39AD4&p=0