Probably 'cos humans fight their instincts to merely shout noises, and want to try to remain in control - which manifests through use of a word that is close to the sound/noise that we would otherwise instinctively come out with.
When we do lose control, our instincts take over and we don't verbalise the sounds (e.g. the scream etc).
Or something like that.
When we do lose control, our instincts take over and we don't verbalise the sounds (e.g. the scream etc).
Or something like that.