That moment when your Mum tells you about a cold caller builder chap turning up offering to do work on porch and guttering. They allowed him to convince them to let him in the house and kept talking to them till they agreed a price.
A/thank god ok
B/ they slept badly and when he turned up for money and start work they cancelled him as realised they had been taken in.....
I did my stern Mother what were you thinking letting him in when you did not feel it was the right thing to do voice.