My friend called a Venetian-blind repairman to come pick up a faulty blind.
The next morning, while the family was at breakfast, the doorbell rang. My friend's wife went to the door, and the man outside said,
"I'm here for the Venetian blind. "
Excusing herself in a preoccupied way, the wife went to the kitchen, fished a dollar from the food money, pressed it into the repairman's hand, then gently closed the door and returned to the table.
"Somebody collecting, " she explained, pouring the coffee.