Westland Lynx AH7
Nope! I've not uploaded this image upside-down! This is the ONLY helicopter in the world, that can do a full 360! (And no "Turbo-Boost" either! Take THAT 'Blue Thunder'!)
PS: Do NOT try this at home, these are 'Trained Professionals'!
(AKA: "Certifiably NUTS"!!!!)