What bored people do. My mother loves it when a lizard gets in the house. At 89 that's a little excitement in her life. My mother, sister, and I watched these two lizards meeting in the window and wondered if they were going to fight or what.
They met without incident and then passed on.
Each went his separate way.
This one looks back as if he (or she) is thinking of lost love.
Maybe this one is thinking "who could love someone as ugly as me".