history: I was walking in the yard. All of a sudden I slipped and almost fell. I had stepped into a gigantic pile of horse dung! Have you ever stepped in the horse poo? I haven't_comma_ though I've stepped in other poo.  Is it similar to others?
current: Yes a little bit. What types of poo have you stepped in?
next: Dog mostly, cat once or twice.  Possibly human, but I'd rather not think too hard on that.