[s]Fixes writing bugs/exploits

code/modules/food_and_drinks/pizzabox.dm

@@ -197,8 +197,13 @@
 			to_chat(user, "<span class='notice'>[src] already has a bomb in it!</span>")
 	else if(istype(I, /obj/item/pen))
 		if(!open)
+			if(!user.is_literate())
+				to_chat(user, "<span class='notice'>You scribble illegibly on [src]!</span>")
+				return
 			var/obj/item/pizzabox/box = boxes.len ? boxes[boxes.len] : src
 			box.boxtag += stripped_input(user, "Write on [box]'s tag:", box, "", 30)
+			if(!user.canUseTopic(src, BE_CLOSE))
+				return
 			to_chat(user, "<span class='notice'>You write with [I] on [src].</span>")
 			update_icon()
 			return