Parrot stress relief pull:

Buffs parrots health from 20 to 80.
Parrots have gone from opportune attackers (attack weak babies) to aggressive idiots (attack so long as I have good health)
Fixes a obscure little bug where a parrot left alone without anyone to hear them couldn't speak through radios.
Ghost poly can now posses people who try to attack them and force them to spout parrot lines.
The ghost poly easter egg now has a very rare chance of happening every time poly dies.

code/datums/diseases/parrotpossession.dm

@@ -0,0 +1,27 @@
+/datum/disease/parrot_possession
+	name = "Parrot Possession"
+	max_stages = 1
+	spread_text = "Paranormal"
+	spread_flags = SPECIAL
+	disease_flags = CURABLE
+	cure_text = "Holy Water."
+	cures = list("holywater")
+	cure_chance = 20
+	agent = "Avian Vengence"
+	viable_mobtypes = list(/mob/living/carbon/human)
+	desc = "Subject is possesed by the vengeful spirit of a parrot. Call the priest."
+	severity = MEDIUM
+	var/mob/living/simple_animal/parrot/Poly/ghost/parrot
+
+/datum/disease/parrot_possession/stage_act()
+	..()
+	if(!parrot || parrot.loc != affected_mob)
+		cure()
+	else if(prob(parrot.speak_chance))
+		affected_mob.say(pick(parrot.speech_buffer))
+
+/datum/disease/parrot_possession/cure()
+	if(parrot && parrot.loc == affected_mob)
+		parrot.loc = affected_mob.loc
+		affected_mob.visible_message("<span class='danger'>[parrot] is violently driven out of [affected_mob]!</span>", "<span class='userdanger'>[parrot] bursts out of your chest!</span>")
+	..()