This is a bit more complicated score, Happening in the city you need a bigger group (at elast 5) for this.

Person A and person B are having a talk. Subject can be whatever. they try to maintain eye contact.

All the other members of the group are behind person A.

One by one they walk into the field of vision of person A.
When person A thinks that she can see the whole group, she informs B by saying, “all here”