As I thought about it, I realized that most of the people who come and work in our house whistle while they work.
Last week we had a plumber come in to fix a leak in our sink. He too passed his time clanking away at the metal pipes while whistling a tune to himself.
We had a friend of ours come and fix a bed that had broke. He didn't whistle as much as he sang all sorts of different songs while he banged our bed back together.
And every morning the caretaker of our compound gets out his broom and sweeps the compound, waking us all up as he whistles while he works.