Dangerous kites

They fly lots of kites in the favelas and to make it more interesting they fight, using glass infused string to cut the strings of other kites (yes, just like in The Kite Runner). An unintended consequence is that the (glass laced) strings of the losing kite can be carried off and get tangled up across roads, decapitating unsuspecting motorcyclists. Bikes sometimes have radio aerials on the front (an alternative looks like an aircraft arresting hook, pictured), not because the rider wants to listen to Radio Rock on their way home, but just because they want to get there intact.