Adds a special suicide action to air tanks (#18575)

* Add /tg/ tank suicide_act

* Review

code/game/objects/items/weapons/tanks/tanks.dm

@@ -115,6 +115,20 @@
 
 		qdel(src)
 
+/obj/item/tank/suicide_act(mob/user)
+	var/mob/living/carbon/human/H = user
+	user.visible_message("<span class='suicide'>[user] is putting [src]'s valve to [user.p_their()] lips! It looks like [user.p_theyre()] trying to commit suicide!</span>")
+	playsound(loc, 'sound/effects/spray.ogg', 10, TRUE, -3)
+
+	if(!QDELETED(H) && air_contents && air_contents.return_pressure() >= 1000)
+		var/obj/item/organ/external/head/head = H.get_organ("head")
+		head.disfigure()
+		H.inflate_gib()
+		return OBLITERATION
+
+	to_chat(user, "<span class='warning'>There isn't enough pressure in [src] to commit suicide with...</span>")
+	return SHAME
+
 /obj/item/tank/deconstruct(disassembled = TRUE)
 	if(!disassembled)
 		var/turf/T = get_turf(src)

code/modules/mob/living/death.dm

@@ -101,3 +101,9 @@
 	Weaken(30 SECONDS)
 	do_jitter_animation(1000, -1) // jitter until they are gibbed
 	addtimer(CALLBACK(src, .proc/gib), rand(2 SECONDS, 10 SECONDS))
+
+/mob/living/carbon/proc/inflate_gib() // Plays an animation that makes mobs appear to inflate before finally gibbing
+	addtimer(CALLBACK(src, .proc/gib, null, null, TRUE, TRUE), 25)
+	var/matrix/M = matrix()
+	M.Scale(1.8, 1.2)
+	animate(src, time = 40, transform = M, easing = SINE_EASING)