Haha, Not laughing at you, but that is good, I haven’t heard that before! I like it.
You say JUST, but yeah, it is only a magnet, that has taken a lot of development, I believe the best “strength” to size, balancing out the size of the magnet with the thickness of the encapsulation.
personally I don’t have one or need one, and In my mind, when I think of implantable magnets, I think magicians, but others seem to have them for “party tricks” and some have had success as sense magnets.
@SurvivalMistakes implanted one as a method to magnetize 
an object in a survival situation that I quite liked. HERE
Not quite, There are quite a few examples, but best to direct you to @NiamhAstra great placement Wiki