Shitty Dual
schroedinger's fat

http://www.foundmagazine.com/find/566
From the comments:
Tracy in Cape Town, South Africa said:
two scenarios:
1.person is driving around trying to find a parking space and notices the asshole who took up the spaces, and is really riled up. furiously, the person runs up stairs, types up the above letter, prints it out, rips it from the printer, and places it on the windshield of the asshole's car.
2. person understands the asshole parking situation happens frequently so he/she keeps a stack of these letters printed out in his/her car and places them accordingly.