My mother's house used a cuckoo sound: when it was dinner time, her mom would summon the kids home with the loudest of cuckoos that could be heard for blocks around. Kids who didn't present for dinner ... didn't get dinner.

This has become a running joke even amongst us grandkids, and the cousins all joke about it. But when I was on the other side of a LONG ferry queue (reminiscient of a wally-world parking lot) I heard the lilting tones on the wind of a far-off 'cuc-koooooo' and there was the (ex-army, some related voice-training) sibing waving enthusiastically.