What could happen if jumper cables are put on wrong?

If jumper cables are connected incorrectly, such as attaching the positive cable to the negative terminal or vice versa, it can cause a short circuit, potentially damaging the vehicles' electrical systems. This misconnection may lead to sparks, battery explosions, or even electrical fires. Additionally, it can damage the alternator, fuses, or other components in both vehicles, leading to costly repairs. Always ensure proper connections to avoid these hazards.