Rowley was grounded from the television for a week in the 'Diary of a Wimpy Kid' series because of a simple childish mishap. He accidentally ate the cheese that was left on the basketball court; fell for Greg's trick, which was actually an initiation to the 'Cheese Touch'.
The rumor amongst the school children is that the cheese was cursed, so when his parents found out, they grounded him as a preventative measure to control the situation.
Let's dive deep into this one. This incident comes from the much-acclaimed series Diary of a Wimpy Kid. The character we're talking about is Rowley Jefferson, an innocently naive and rather obtuse boy, who also had the good fortune to be the best friend of our titular wimpy kid, Greg Heffley.
But Greg, being older and more streetwise than Rowley, often leads him into difficult situations. Some are amusing, others are positively humiliating, and yet still others again can be pretty grave; this particular incident belongs to the second category.
It arose one fateful day at school: A piece of cheese had been left lying around on the basketball court, and from this, a 'Cheese Touch' story started. Whoever was said to suffer from the 'Cheese Touch' would be cut off from all ordinary glasses. Greg used this story to deceive Rowley into re-enacting the whole business of 'CheeseTouch'.
When a hint of this got back to Rowley's parents, they thought it most inappropriate and disarranged due to his condition for a week all TV privileges at home. It was their way of setting an object lesson to him, letting him see which mischievous activities should not be undertaken even on any pretext.