Forrest was at Countdown when he noticed a bloke blatantly walking out of his local without paying for his groceries.
So like the public vigilante that he is - he chased the shoplifter around the supermarket carpark before trying out some of his Brazilian Jiu Jitsu moves on the scumbag:
...ripped him up into a mean kimura. Had to explain to him: mate, you can't tap in a street fight aye.
That's one way to do it.