This is so true, especially with my little one:)
If I want it, it's mine. If I give it to you and change my mind later, it's mine. If I can take it away from you, it's mine. If I had it a little while ago, it's mine. If we are building something together, all of the pieces are mine. If it looks like mine, it's mine. If it's mine it will never belong to anyone else, no matter what.