We suspect that whoever placed this note on this car had suffered in silence for long enough, and one day they just snapped! Seeing a handwritten note stuffed under your wiper is always a bad sign. It's unlikely a stranger has taken the time to write you a glowing compliment. It's far more likely that the presence of your vehicle has angered them somehow, and they've decided to let you know about it.
In this case, the note is from an angry driver who's found that their own car is blocked in by someone else's ignorant parking. Apparently, that driver also owns a monster truck. Whether they really do own such a truck or not is unknown, but if you received this note would you take the chance of finding out? We suspect they parked more thoughtfully next time.