Squirrel 41
I guess you weren't on 43 when they flew Phantom FGR2's and lived in 2 Hangar (No HAS in those days). Eng Wing stole the live Bantam cockerel that lived in a coop outside the hangar and replaced it with a frozen Buxted chicken. Sqn aircrew thought it was mildly amusing - Sqn SEngO went ballistic. BTW the cockerel wasn't harmed.