In my neighborhood, there was this cat who used to run up to me for pats and cuddles every time I passed his house.
One day, I saw him sleeping in a empty lot next door to his house.
I started calling out to him in a baby voice and made "shh shh" noises to get his attention.
He was sleeping, curled up, with his back to me. He lifted his head, turned his head and faced me, looking content but fixated on me.
I waved "Hello!" but he just looked at me, frozen. He did seem happy, but the way he was looking at me made me feel I was an intruder.
The expression on his (still and fixated) face was like this kitty pic (excuse it being upside down).
The cat never came up to me again. The fact that he was looking at me still and not coming up for cuddles anymore was worrying.