Random curiosity towards people?
Sometimes when i'm in public transport or something, i can just look at somebody and i'm like "Why would that person be here? How would his home look like. What did he study? Would he be a nice guy? Where could he possibly be going?" and other random stuff like that.
By the way, these random questions apply to buildings too. When i'm in the bus and i pass this building with no light on or anything i often can't help but wonder what could possibly be going on in there.