Stairs are Dangerous (#9210)

* Crates, closets, rollerbeds and wheelchairs now cannot safely traverse
stairs.

code/game/objects/structures/crates_lockers/closets.dm

@@ -765,6 +765,19 @@
 		QDEL_NULL(linked_teleporter)
 	return ..()
 
+/obj/structure/closet/stair_act()
+	if(opened || !can_open())
+		return
+
+	visible_message(SPAN_WARNING("\The [src] flies open as it bounces on the stairs!"))
+	for(var/thing in src)
+		var/atom/movable/AM = thing
+		AM.forceMove(get_turf(src))
+		AM.throw_at_random(TRUE, 1, 2)
+	open()
+
+	return ..()
+
 /*
 ==========================
 	Contents Scanner

code/game/objects/structures/stool_bed_chair_nest/bed.dm

@@ -308,6 +308,21 @@
 		else
 			occupant.visible_message(SPAN_DANGER("[occupant] crashed into \the [A]!"))
 
+/obj/structure/bed/stair_act()
+	if(!buckled)
+		return
+
+	var/atom/movable/unbuckled_atom = unbuckle()
+	if(!unbuckled_atom)
+		return
+
+	unbuckled_atom.visible_message("<b>\The [unbuckled_atom]</b> goes flying out of \the [src] as it bounces on the stairs!", SPAN_WARNING("You go flying out of \the [src] as it bounces on the stairs!"))
+	unbuckled_atom.throw_at_random(FALSE, 1, 2)
+
+	if(ismob(unbuckled_atom))
+		var/mob/unbuckled_mob = unbuckled_atom
+		unbuckled_mob.Paralyse(5)
+
 /obj/structure/bed/psych
 	name = "psychiatrist's couch"
 	desc = "For prime comfort during psychiatric evaluations."
@@ -565,6 +580,9 @@
 	.=..()
 	set_light(2,1,LIGHT_COLOR_CYAN)
 
+/obj/structure/bed/roller/hover/stair_act()
+	return
+
 /obj/item/roller
 	name = "roller bed"
 	desc = "A collapsed roller bed that can be carried around."