The Norse teen (Jay Baruchel) is trying to change his image, messing with a crossbow, when he snares a baby dragon. He draws a dagger, but instead feeds the creature a fish. The big little guy barks, regurgitating half a salmon onto Hiccup's lap. Sharesies. From then on, the two are BFF.
Later, Hiccup is thrown into a dragon pit, but emerges unscathed. The teenager discovers the secret trick to extinguishing fire-breathing reptiles: Dragons like having their tummies rubbed.