There was once a boy called Mario who loved to have lots of friends at school. However, he wasn't sure whether or not his classmates were his true friends, so he asked his grandpa. The old man answered, "I have just exactly what you need; it's in the attic (阁楼). Wait here for a minute."
Grandpa left, soon returning as though carrying something in his hand, but Mario could see nothing there. "Take it. It's a very special chair. Because it's invisible (无形的), it's rather difficult to sit on; but if you take it to school and you manage to sit on it, you'll be able to tell who your true friends are."
Mario took the strange invisible chair and went to school. At break time he asked everyone to form a circle, and he put himself in the middle, with his chair. "Nobody move. You're about to see something amazing," Mario said.
Then Mario tried sitting on the chair. He missed and fell straight onto his backside. Everyone had a pretty good laugh. Mario wouldn't be beaten. He kept trying to sit on the magic chair, and kept falling to the ground ...until, suddenly, he tried again and didn't fall. This time he sat, hovering (悬停) in midair.
Looking around, Mario saw George, Lucas, and Diana—three of his best friends—holding him up, so he wouldn't fall. At the same time, many others he had thought of as friends were doing nothing but make fun of him, enjoying each and every fall.
Leaving with his three friends, Mario explained to them how his grandpa had so cleverly thought of such a good idea. Mario was quite thankful to his grandpa, who helped him test who his true friends were. Those who take joy in our misfortunes (不幸) when we are in difficulty are not our true friends.
