The best foley is so well intergrated into the game/film that it is unnoticed by the veiwers, they don't think about it being created outside the game and therefore it creates a sense of realim and believability.Foley gets it's name from the sounds effect specialist Jack Foley (1891-1967) who developed alot of techniques that are still being used today in games and films, for example: old wooden chairs are still used to create the sound of creaky floorboards,and cutting water melons are still used to create the sound of blood and gushing sounds.