People appreciate having their things returned to them.
John has finished a home project with which he used a friend's tools to complete.
John wants to start a new project.
John contacts his friend to return his tools before preparing for his next project.
John begins a new project and continues to use his friend's tools for the new project.
John's friend appreciates the gesture and offers John tools to use for the next project.
John's friend becomes annoyed that John has had his tools for so long and grows resentful of him.