We have all seen the guy/gal who parks there car in such a way that the next parking 
space is virtually unusable (like this picture ->). Well you can get mad and key the car (not recommended) or you can give them that awful feeling of getting a parking ticket. This 100 pack of Fake Parking Tickets ($14.95) is bright orange and sure to be noticed by the victim.
Some of the goofy violations listed include, "you deserve it", "triple parking", and "oops!". Not the best violations, but will still have the desired effect.