I honestly can't remember, but I'm sure it has to be a Disney. The mom comforting her child in Dumbo or the gunshot in Bambi. And my first tears of terror had to be either Doom in Roger Rabbit ("Remember me, Eddie?") or the boy turning into a mule in Pinocchio. Even more than Monstro the Whale, the thought of transforming into a jackass and being captured and taken away cued into some sort of primal terror. Maybe my growing-up-Catholic anxiety that one bad sin is all it would take.