Goliath's Helmet

The other night I was lying in bead and for some reason, I was thinking about the story of David and Goliath. The thought hit me, what happened to Goliath's helmet?

1 Samuel 17: ⁴And there went out a champion out of the camp of the Philistines, named Goliath, of Gath, whose height was six cubits and a span.
   ⁵And he had an helmet of brass upon his head, and he was armed with a coat of mail; and the weight of the coat was five thousand shekels of brass.

I know a bit about metal but not much in the way of philistine armor. Brass is a soft metal. It would serve well to absorb the impact of a stone without much damage to the wearer. Perhaps the helmets only protected the tops and back of the head and not the forehead. I ran a search on philistine armor and by all accounts, the helmet would have covered all of Goliath's forehead. So how did David stick a rock in Goliath's forehead?
(1 Samuel 17: 49)

I do not intend to discredit God's hand in this matter but this is what I think may have happened.  I think Goliath saw David unarmored and without a sword. Seeing this obviously insulted Goliath's ego. After all, he did say "Am I a dog that you come at me with sticks?" (1 Samuel 17:43) . If you read the chapter, Goliath approached David (Verse 41) but later in the passage it says, "when the philistine arose" (Verse 48). Why was he getting up? Why did he sit down? I think he sat down to remove his armor, helmet included.
Surly a man of Goliath's size wouldn't need all this armor against a child. I think Goliath removed his armor in an act of pride.

Now back to my world. How many times do I remove my armor in an act of pride? "I know what I am doing, why do I need instructions?" "No, I got it. I don't need help lifting this." "I know where I am going, I don't need to ask directions"

It has me wondering how many times my downfalls were my own doing. We have armor all around us. Our friends, family, faith and our God. How many times do I push these away to fulfill a selfish sense of pride. How long until this pride lands a rock in my scull?

Proverbs 16:¹⁸"Pride goeth before destruction, and an haughty spirit before a fall."