It was Puck a while back. He was completely unexpected, and he decided to move right in the middle of the narrowest strip of land in my town. And I use it very often! But I moved him out!
Right now, Agnes has the worst spot. She keeps trying to move in the worst places, even though I have a specific area I want her to live in. Last night, she was in the general area where I wanted her, but her plot was 3 spaces down too far, and her house was too close to Shep's. ;-; First world problems.