I said calmly, "It is. How may I help you".....?
There was a silence. Then the phone was put down.
Two minutes later it rang again.
"Oi
"Speaking." I said. Followed by a slam of the receiver at the other end.
The wife came downstairs and said, "Who was that on the phone"....?
Wearily I said, "Your mother....
Spoiler:

