Times characters who have entirely different stories meet

What I mean to say is when two characters who aren't ever together in a scene are, even if they aren't talking to each other. Examples are Chris Partlow asking Rhonda Pearlman where the clerks desk was in season 5. Also Jimmy and Alma being in the same shot in that season as well, at the 24 hours grocery store.

I love these types of interactions, I think it's a part of the genius of The Wire. Any other good examples of this type of interaction on the show?