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Beeping Computers and Pac-Man Fever cover the standard sounds of modern technology and interactive entertainment.On loose surfaces like gravel, grass/soil, sand, snow, and so on, tires simply cannot squeal. Squealing tires are Truth in Television when a car is driven at or slightly beyond the very limits of the tires' performance, but only on hard surfaces that provide enough friction, such as paved roads.
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Real recorded hoofbeats on later, more sophisticated productions sounded "wrong" to test audiences (or more likely, clueless producers). Nevertheless, filmmakers and radio producers stuck the coconut sound on the audio track even when the horse was on grass or gravel (rarely even in synch with the movement of the horse) until audiences came to expect the specific audio cue. However, it's fair to say that the vast majority of depictions of horses are upon dirt, grass, or other unimproved terrain where the sound would be muffled to inaudibility. when the horse is walking on cobblestones or some other hard pavement. Horses hooves do sound like a pair of coconut shells being tapped together. The trope namer is the traditional foley effect of using hollow coconut shells to recreate the sound of horse hooves in theater, and later radio, film and television. The Coconut Effect describes any sound effect, special effect, or design feature that is unrealistic, but still has to be included because viewers have been so conditioned to expect it that its absence would be even more jarring.