I want to park for a second on the car battery person, and how apparently part of their free energy device is to "punch a hole" in a car battery, pour the battery acid out, and pour your new concoction in. That seems, in a word, safe.
Also, they probably just connected something wrong in multisim, just like every electrical engineering student. Except instead of asking the professor what they did wrong, they just assumed they'd found a free energy machine.