Showing brain first pass

code/modules/mob/living/carbon/human/update_icons.dm

@@ -247,10 +247,13 @@ proc/get_damage_icon_part(damage_state, body_part)
 			var/list/TONE = ReadRGB(hulk_color_mod)
 			stand_icon.MapColors(rgb(TONE[1],0,0),rgb(0,TONE[2],0),rgb(0,0,TONE[3]))
 
-	var/datum/organ/external/head = get_organ("head")
+	var/datum/organ/external/head/head = get_organ("head")
 	var/has_head = 0
+	var/brain_showing = 0
 	if(head && !(head.status & ORGAN_DESTROYED))
 		has_head = 1
+		if(head.brained==1)
+			brain_showing = 1
 
 	for(var/datum/organ/external/part in organs)
 		if(!istype(part, /datum/organ/external/chest) && !(part.status & ORGAN_DESTROYED))
@@ -316,6 +319,9 @@ proc/get_damage_icon_part(damage_state, body_part)
 		if(lip_style && (species && species.flags & HAS_LIPS))	//skeletons are allowed to wear lipstick no matter what you think, agouri.
 			stand_icon.Blend(new/icon('icons/mob/human_face.dmi', "lips_[lip_style]_s"), ICON_OVERLAY)
 
+		//Brain showing
+		if(brain_showing)
+			stand_icon.Blend(new/icon('icons/mob/dam_human.dmi', "brain"), ICON_OVERLAY)
 	//Underwear
 	if(underwear >0 && underwear < 12 && species.flags & HAS_UNDERWEAR)
 		if(!fat && !skeleton)

code/modules/organs/organ_external.dm

@@ -753,6 +753,7 @@ This function completely restores a damaged organ to perfect condition.
 	min_broken_damage = 40
 	body_part = HEAD
 	var/disfigured = 0
+	var/brained = 0
 
 /datum/organ/external/head/get_icon()
 	if (!owner)
@@ -772,6 +773,10 @@ This function completely restores a damaged organ to perfect condition.
 				disfigure("brute")
 		if (burn_dam > 40)
 			disfigure("burn")
+	if(!brained)
+		if(brute_dam > 25)
+			if(prob(10))
+				breakskull()
 
 /datum/organ/external/head/proc/disfigure(var/type = "brute")
 	if (disfigured)
@@ -786,6 +791,17 @@ This function completely restores a damaged organ to perfect condition.
 		"\red You hear a sickening sizzle.")
 	disfigured = 1
 
+/datum/organ/external/head/proc/breakskull()
+	if(brained)
+		return
+	owner.visible_message("\red The top of \the [owner]'s skull breaks, exposing the brain help within.",	\
+	"\red <b>Unbearable pain hits you as the top of your skull breaks and exposes your brain!</b>",	\
+	"\red You hear a sickening crack.")
+	brained = 1
+	owner.h_style = "Bald"
+	owner.drop_from_inventory(owner.head)
+	owner.update_body()
+
 /****************************************************
 			   EXTERNAL ORGAN ITEMS
 ****************************************************/