Boys will be boys, but this is an accident waiting to happen. Once in a while you can see boys who live near the center of the city riding their bikes in the pedestrian zone. They like to grab onto rear bumpers of streetcars and be pulled at high speeds down the streets, usually along two blocks. There is practically no way they can be caught.
People in the street cannot see them. And if they do, the streetcar is already behind them and there is no way to alert the driver. And people riding the tram cannot just press the emergency brake because it would activate the magnetic brakes and unsuspecting passengers could get seriously hurt. Chances are, the two boys will enjoy their two-block ride and pedal away…
Of course they always make sure there are no cops on patrol in the street before they perform their stunts. And as patrols on foot are seen well ahead (due to their hi-viz jackets), the bikers are safe from hefty fines…