In effectiveness training, we learn the art of the three-part Confrontive I-Message in order to try and influence behavior that's causing a tangible problem for you.

I appreciate the way this skill offers the best chance of avoiding blame and leaving a relationship intact – even with strangers. I left this message on the car of someone I didn't know and felt good about practicing the skill.

I didn't have a chance to hear the person's response, because they weren't around, but the car moved and has not parked in the spot again.