How many substances do you consider smearing across a badly parked car before you arrive at peanut butter? We're not sure, but we'd say it's probably quite a long way down our list. Looking at the way it's been applied to the windshield in neat lines, someone took their time to do this. It's a strange way of going about telling people that they don't know how to park, but as it says in the peanut butter, it's cheaper than paying for someone to come and tow the vehicle away.
We think it would last longer in the memory, too. Getting your car towed is annoying - and expensive - but it's the sort of thing that might happen as part of any day, so you just accept it. You'll never forget the day your car was covered n peanut butter, even if there was a polite note along with it which explained why it had happened.