If I owned this car I'd fix the alarm ASAP.

Most people aren't this casual with "fuck you"'s unless they're at a Karaoke bar singing a Cee Lo song. That's what makes me think whoever wrote this is serious. I wish there was some way to subscribe to an exchange started by a windshield note, because I'd love to find out how this one plays out. Does the person fix the alarm? Do they blow off the note and roll the dice? Or, do they set it off on purpose, then hide in the bushes with a baseball bat waiting to pummel the Key Crusader? This situation is more suspenseful than most cop shows.

Sources: Redditor Trying2SaveHumanity