A game played by two or more players. Whilst walking and/or driving, swimming, flying, riding a bicycle, etc. whenever a ninja (an muslim lady wearing religious headwear, technically called a peepscarf, that only shows her face and/or eyes) is spotted, you must hit another player on the arm and/or leg, crotch, nose and/or head whilst exclaiming as loudly as possible the words 'Ninja Bash!' Also known as postboxing.
Mate, have you got my.... NINJA BASH!... golf clubs?