Doug MacAdam learned to whistle by imitating PopPop, his grandfather. He uses whistling to call for someone’s attention, applaud a wonderful achievement, call an unruly meeting to order, or paralyze children in the midst of inappropriate behavior.

Doug MacAdam learned to whistle by imitating PopPop, his grandfather. He uses whistling to call for someone’s attention, applaud a wonderful achievement, call an unruly meeting to order, or paralyze children in the midst of inappropriate behavior.