Hi guys...........heres one...........go to the store and buy one can of spray paint in say bright green, and a can of washable hair-colour spray in same or near same colour.

Use washable spray to write something on his car in HUGE letters....ie..."John is a nancy-spanker". Then leave the can of spray PAINT sitting on the car.

Watch his face when he thinks the message is in permanent colour !!!!!!!!!!!!!!

Then...................RUNNNNNNNNNNNNNNNNNNNNNNNNN NNNNNN