Working in door-to-door sales,
you were allowed to ring doorbells until 21:00 and no later, unless you'd already been to that house and spoken to someone who'd asked you to come back later. This was "doing callbacks".

My boss Mark and his colleague Gareth were doing callbacks one night when some busybody spotted them, two unknown men in suits wandering around in the neighbourhood for no discernible reason, and called the police. The police turned up and said "Mind telling us what you're doing, lads?", so Mark and Gareth said they were just collecting donationsf for charities (technically true). The policeman said "Wait here", went back to his patrol car and started calling in the details.

A few minutes later he came back, turned to Gareth and said "Why'd you give us a false name, Gary?". Turns out Gareth had the same surname and perfectly matched the physical description of a local career criminal called Gary, and the copper was standing there listening to the crackly voice on his radio reading out the litany of Gary's offences: assault and battery, resisting arrest, taking without consent, etc.

Gareth got back to the office much later than usual that night.
( .Yeti. El amor en los tiempos del cólera, Wed 21 Sep 2016, 9:55, Reply)