Tour company Ride the Ducks is suing rival tour company Bay Quackers, alleging that it holds trademark rights to the sound made by tourists using duck call devices
, while on amphibious vehicle tours. San Francisco-based Ride the Ducks holds a 'sound mark
' on the noise. Very few companies hold sound marks, but some of the more famous include: the NBC chimes and the MGM lion. The company holds US Trademark No. 2,484,276, which protects a mark consisting of 'a quacking noise made by tour guides and tour participants by use of duck call devices throughout various portions of [guided amphibious vehicle] tours.' Reading this makes my think that there is a room full of litigious monks somewhere, just waiting for someone to try clapping with one hand.