"They're going to throw those " David said urgently. Carol was just assuring him that he was worrying unnecessarily when the first stones came hurtling across at the party. Our official City Guide immediately retaliated by picking up cobble stones himself and hurling them back at the youths..." This was just one of many unexpected incidents, such as having to sleep in a blood-spattered hotel room or being served a meal of inedible Ilama meat followed by fizzy fruit salad, that made this trip to Brazil, Peru and Bolivia so unforgettable.