Take a moment to think about the mindset of the person who presumably paid to have a whole batch of these stickers made. We doubt they stopped at one or two, so there is probably a whole range of these out there somewhere, stuck to offending vehicles wherever the endeavoring printer found them. In this age of social media, when seemingly every aspect of everybody's life is uploaded to the internet for the approval of our peers, someone has borrowed the language of Facebook to use as a parking critique.
The message couldn't be more simple - and descends into a few swear words lower down which have been censored out - but it's clear that the driver in question isn't going to get any 'likes' from the person inconvenienced by their parking. Quite the opposite. There's even a threat of vandalism if they repeat the offense, which we don't condone. It was probably enough to make the perpetrator get it right next time, though.