Fun fact: If (big if) Goliath really existed, he was probably suffering from acromegaly. It is characterized by a person not stopping to grow after puberty. The reason for that is an enlarged, tumorous pituary gland in the brain. So David hitting Goliath between the eyes might actually have ruptured the tumour, leading to internal bleeding in his brain and killing Goliath.

So the whole biblical story might be based on something that actually happened and then probably got more and more dramaticised every time it was told.