Ah ha, but I am allowed to fly a defaced blue (NZ national flag) - shall I come visiting or will the machete ones get me /forums/images/icons/smile.gif?
I fancy a Paint-gun ! Nice big 'splodge' right in middle of mainsail or power-boat fly-bridge. For Jet-skis - well you can just about splat the whole affair ????
Take a bit of explaining wouldn't it by targeted party in club bar / marina !!!
Trouble is - any action to get satisfaction will likely create 'water-rage' mentality ......
Yoghurt pots work brilliantly. Arm them by cutting a slit across the foil lid. Aim at crew for short term effect, aim at sail (or other fabric) for long-term irritation.