Ouch.

code/game/objects/items/cardboard_cutouts.dm

@@ -74,6 +74,7 @@
 	playsound(src, 'sound/weapons/slice.ogg', 50, 1)
 	if(prob(P.damage))
 		push_over()
+	return BULLET_ACT_HIT
 
 /obj/item/cardboard_cutout/proc/change_appearance(obj/item/toy/crayon/crayon, mob/living/user)
 	if(!crayon || !user)

code/game/objects/items/chrono_eraser.dm

@@ -242,7 +242,7 @@
 		if(Pgun && istype(Pgun))
 			Pgun.field_connect(src)
 	else
-		return 0
+		return BULLET_ACT_HIT
 
 /obj/effect/chrono_field/assume_air()
 	return 0

code/game/objects/items/devices/chameleonproj.dm

@@ -146,7 +146,7 @@
 	master.disrupt()
 
 /obj/effect/dummy/chameleon/bullet_act()
-	..()
+	. = ..()
 	master.disrupt()
 
 /obj/effect/dummy/chameleon/relaymove(mob/user, direction)

code/game/objects/items/latexballoon.dm

@@ -40,8 +40,10 @@
 			if (prob(50))
 				qdel(src)
 
-/obj/item/latexballon/bullet_act()
-	burst()
+/obj/item/latexballon/bullet_act(obj/item/projectile/P)
+	if(!P.nodamage)
+		burst()
+	return ..()
 
 /obj/item/latexballon/temperature_expose(datum/gas_mixture/air, temperature, volume)
 	if(temperature > T0C+100)

code/game/objects/items/melee/misc.dm

@@ -358,7 +358,8 @@
 /obj/item/melee/supermatter_sword/bullet_act(obj/item/projectile/P)
 	visible_message("<span class='danger'>[P] smacks into [src] and rapidly flashes to ash.</span>",\
 	"<span class='italics'>You hear a loud crack as you are washed with a wave of heat.</span>")
-	consume_everything()
+	consume_everything(P)
+	return BULLET_ACT_HIT
 
 /obj/item/melee/supermatter_sword/suicide_act(mob/user)
 	user.visible_message("<span class='suicide'>[user] touches [src]'s blade. It looks like [user.p_theyre()] tired of waiting for the radiation to kill [user.p_them()]!</span>")

code/game/objects/items/shooting_range.dm

@@ -60,7 +60,7 @@
 #define DECALTYPE_BULLET 2
 
 /obj/item/target/clown/bullet_act(obj/item/projectile/P)
-	..()
+	. = ..()
 	playsound(src.loc, 'sound/items/bikehorn.ogg', 50, 1)
 
 /obj/item/target/bullet_act(obj/item/projectile/P)
@@ -89,8 +89,8 @@
 		else
 			bullet_hole.icon_state = "dent"
 		add_overlay(bullet_hole)
-		return
-	return -1
+		return BULLET_ACT_HIT
+	return BULLET_ACT_FORCE_PIERCE
 
 #undef DECALTYPE_SCORCH
 #undef DECALTYPE_BULLET

code/game/objects/structures/holosign.dm

@@ -106,6 +106,7 @@
 		take_damage(10, BRUTE, "melee", 1)	//Tasers aren't harmful.
 	if(istype(P, /obj/item/projectile/beam/disabler))
 		take_damage(5, BRUTE, "melee", 1)	//Disablers aren't harmful.
+	return BULLET_ACT_HIT
 
 /obj/structure/holosign/barrier/medical
 	name = "\improper PENLITE holobarrier"
@@ -152,6 +153,7 @@
 
 /obj/structure/holosign/barrier/cyborg/hacked/bullet_act(obj/item/projectile/P)
 	take_damage(P.damage, BRUTE, "melee", 1)	//Yeah no this doesn't get projectile resistance.
+	return BULLET_ACT_HIT
 
 /obj/structure/holosign/barrier/cyborg/hacked/proc/cooldown()
 	shockcd = FALSE

code/game/objects/structures/reflector.dm

@@ -64,15 +64,15 @@
 	var/ploc = get_turf(P)
 	if(!finished || !allowed_projectile_typecache[P.type] || !(P.dir in GLOB.cardinals))
 		return ..()
-	if(auto_reflect(P, pdir, ploc, pangle) != -1)
+	if(auto_reflect(P, pdir, ploc, pangle) != BULLET_ACT_FORCE_PIERCE)
 		return ..()
-	return -1
+	return BULLET_ACT_FORCE_PIERCE
 
 /obj/structure/reflector/proc/auto_reflect(obj/item/projectile/P, pdir, turf/ploc, pangle)
 	P.ignore_source_check = TRUE
 	P.range = P.decayedRange
 	P.decayedRange = max(P.decayedRange--, 0)
-	return -1
+	return BULLET_ACT_FORCE_PIERCE
 
 /obj/structure/reflector/attackby(obj/item/W, mob/user, params)
 	if(admin)

code/game/objects/structures/statues.dm

@@ -124,7 +124,7 @@
 			message_admins("Plasma statue ignited by [Proj]. No known firer, in [ADMIN_VERBOSEJMP(T)]")
 			log_game("Plasma statue ignited by [Proj] in [AREACOORD(T)]. No known firer.")
 		PlasmaBurn(2500)
-	..()
+	return ..()
 
 /obj/structure/statue/plasma/attackby(obj/item/W, mob/user, params)
 	if(W.get_temperature() > 300 && !QDELETED(src))//If the temperature of the object is over 300, then ignite

code/game/objects/structures/target_stake.dm

@@ -71,6 +71,5 @@
 
 /obj/structure/target_stake/bullet_act(obj/item/projectile/P)
 	if(pinned_target)
-		pinned_target.bullet_act(P)
-	else
-		..()
+		return pinned_target.bullet_act(P)
+	return ..()