Turtles and Relationships

So you know how there are always those people that you are inexplicably attracted to? You know, the ones you never actually talk to but you're sure they'd be great if you ever did? Did you ever notice how by the time you get up the nerve to become friends with them they're already in a relationship with someone else? That's crap. There should be a way to tell before you get attached to them. For example, when you find a turtle you're supposed to paint a spot on its shell with nail polish. That way if anyone else in the neighborhood finds that turtle, they'll know you found it first.
I just want to know right away when someone already has a claim on my turtle... before I try to paint it myself.