the path of least resistance for the current would be down one connected bolt, then around the top plate, and up the other battery connected bolt, never down the pole, so the ceiling/floor gets heated up, possibly burn

note: those bolts must be supper long to go from ceiling to floor

If you connect one pole of the battery, it does nothing. If you connect both, it just shorts the battery via a path that doesn't involve the downstairs neighbor.

12V from a car battery doesn't do much damage. You'd need, I think, 50V or 52V to get through the skin. Now, of course, if someone were to stick it in their mouth or some other area that doesn't have skin, it's a different story, then they'd get heavy burn marks on the path the electricity takes. So for safer electrocution, use AC, as that will also activate your muscles and push you away. While with DC, you'll stick to it, as you grab onto it with a death grip. For advice on hurting yourself safely, just watch electroboom on yt.

Every reply to your comment is correct. Together they explain everything wrong with the idea in that meme. I have no notes. Bravo @expatriado@lemmy.world @ZkhqrD5o@lemmy.world and @markz@suppo.fi .