A few weeks ago, some guy in a ♥♥♥♥♥♥ BMW parked in my 'reserved and paid for' parking spot in a small lot. I printed out an A4 note stating that this was a paid for parking spot and not to park there again. A couple of days later he parked there again. I printed out an A3 sign stating 'Reserved Parking, Do not park here' sign and used spray adhesive to mount it on the wall in front of my spot. When I went to park in my spot the next day he had written in marker, after "Reserved Parking', the words 'For Wankers'. About three days later I saw his car parked in the street so I printed out a poster in A2 (reversed) with the word '♥♥♥♥♥♥♥♥' and applied it with spray adhesive to his windscreen, ensuring (as per instructions) I sprayed both materials to be bonded. The disadvantage of course is that I am too scared to park in my spot but he is also too scared to park there so I will class this as a draw for the moment and find a new spot.