I would make it glue itself down to what it was setting on when opened too. then an ear piercing alarm like a smoke alarm sound. when they went to throw it out it might even get superglued to their hands....
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Looks pretty good, I considered doing one with the kid; but it was just a bit to intensive for what we have the time for right now. Maybe next year. But maybe some of you know somebody that it might make a nice gift for.