On a similar theme, a friend of mine some years back was walking late at night in Harrogate on the way home when two scrotes walked past him hurriedly.
A short while later one of the scrotes stepped out in front of him and demanded money. The other scrote appeared behind him.
Now said friend is over 6ft tall but slim, nice enough lad, pleasant to talk to, is also a Black belt 2nd Dan in one martial art and a Black Belt 3rd Dan instructor in another

Moments later scrote no1 was unconscious on the floor, scrote no2 was legging it down the road, and said friend nealt over scrote no1, rifled his pockets and releived him of a fiver, just so he (scrote) knew what it felt like to be mugged
Should said friend have announced to the scrotes that night what was about to have happend? Just to stay on the right side of the law that is.
(If you are trained to a level in martial arts you are legally not supposed to use your training on the street - or at least that is what the law used to be)