'An old man is forced to go to a nursing home. He can only leave if he can prove the existence of a dragon, so he sends his grandson into the sewers to take photos of the dragon. The grandson returns with a box which turns out to be a dragon egg from which a baby dragon hatches. Was later adapted as an episode of Round the Twist, was one of two adaptions to be combined into one episode.' (https://en.wikipedia.org/wiki/Unbelievable_(short_story_collection))