Kids. Sneaking, misbehaving, having fun. In this case, schoolkids “hitching a ride” on the streetcar, the famous #28 that traverses all of Lisbon’s most scenic neighborhoods, providing a sightseeing experience for tourists and (consequently) a crowded hassle sometimes for the locals. Unless you happen to be this daredevil, hanging on to the outside on his way home from school, avoiding the fare, having fun. Careful.