It's typically not a great sign to see a small note tucked beneath your windshield wiper as your approach your parked car.
Because, truthfully, no one is making the effort to leave a note, unless they've got a serious bone to pick.
See also: The 20 Scariest Google Street View Sightings
From totally creepy to downright rude, check out these notes we'd rather not find sticking to our cars.
Image: Flickr, Dave Hoffman