It had never been seen on English soil in a pro game, and Watson did it again a few months later at Middlesbrough.
However, the FA banned it - saying it wasn't within the rules - and Watson's throw-in was no more.
But, although it wasn't a throw-in, a goalkeeper in Africa has seen it as the best way to launch a counter-attack.
With Cameroon trailing Egypt 2-1 in stoppage time of a friendly in Sudan last week, the Indomitable Lions' goalkeeper Alan Tshoumi Tiko knew he needed to get the ball upfield.
He came up with a novel way to get the attack going, performing a somersault before launching an incredible long throw that landed deep in the Egyptian half.
Unfortunately for Tiko, the throw was in vain as a Cameroon striker could not get on the end of it and Egypt saw out their 2-1 victory.
Still, it was an impressive piece of skill that brightened up what might otherwise have been a quickly-forgotten friendly.
You can find it on You-Tube.