If I want it, it's mine.

If I saw it first, 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 it looks just like mine, it is mine.

If we are building something together, all the pieces are mine.

If it's mine, it will never belong to anybody else,

            No matter what

      -- Variously ascribed