A boy called Mario had many friends, and he was proud of it. One day, his grandpa said to him, "Mario, I know you don't have as many friends as you think. Many of them are not true to you."
Mario thought maybe his grandpa was right. However, he wasn't sure how he could test if his schoolmates were real friends, so he asked his grandpa. The old man answered, "I have just exactly what you need. It's in my room. Wait a minute." The old man left, soon returned as if carrying something in his hand, but Mario could see nothing there.
"Take it. It's a very special chair. Because it's invisible, it will be hard for you to sit on it. However, if you can sit on it, you can use the chair's magic power to tell who your real friends are."
Mario took the strange invisible chair to school. He asked everyone to form a circle around him and he put himself in the middle, with his chair.
Nobody moves. "Wait and see something amazing," said Mario. Then he tried to sit on the chair. Having difficulty seeing it, he missed and fell to the ground. Everyone had a pretty good laugh. Mario didn't give up. He kept trying to sit on the magic chair again and again. Finally, he did it. To his surprise, this time he felt himself in mid-air.
Looking around, Mario saw George, Lucas and Diana holding him up, so he wouldn't fall. But some schoolmates who he had thought as friends did nothing but made fun of him. Mario was quite thankful to his grandpa for helping him test who his true friends were.