This horn game is so funny that makes your mobile device to a horn. A horn is a sound-making device that can be equipped to motor vehicles, buses, bicycles, trains, trams and other types of vehicles. The sound made usually resembles a "honk" (older vehicles) or a "beep" (modern vehicles). The driver uses the horn to warn others of the vehicle's approach or presence, or to call attention to some hazard. Motor vehicles, ships and trains are required by law in some countries to have horns.