It's not okay to break someone else things.
Matt has found a new toy that was a gift that his brother received.
Matt wants to play with the toy.
Matt makes sure to be gentle with the toy and is careful not to drop or scratch it up.
Matt plays careless with the toy and ends up breaking a piece off of it.
Matt's brother is very pleased with his new toy and plays with it.
Matt's brother doesn't get to enjoy his toy because it's been damaged.