Newton's third law is having an existential crisis! When charged particles move perpendicular to each other, they create magnetic forces that don't follow the whole "equal and opposite" thing. Instead, they're like "Allow us to introduce ourselves" with a smug look because they're bending the rules of classical mechanics.
The magnetic force between moving charges is velocity-dependent and can act at right angles to motion, creating this weird loophole where the forces aren't directly opposite. It's basically electromagnetism showing up to Newton's party with its own rulebook. Physics gets sassy sometimes!