...and not realize it till after?

SCENE: BUILDING ON UPPER WEST SIDE.

                    Girlfriend and I step into the elevator
                    with friend's puppy.  We're joined by a
                    young couple and their child.

                    SMALL CHILD
            (recognizes friend's dog,
             correctly says the dog's name)

                    FEMALE
Yes, it's a puppy.

                    MALE
            (to me)
How old is it?

                    ME
She's about a year old... not sure exactly.  It doesn't
belong to me, it belongs to _______.

                    FEMALE
Oh, it's _____ and _____'s dog.
            (to daughter)
You were right!  It's _______!

                    ME
           (continues in conversation,
            entirely focused on not
            letting the very large black
            lab get too close to the small
            child who both wants to pet it
            but is a bit afraid of it)
My floor.

                   FEMALE AND MALE
Have a nice day!

                   ME
            (looking at them briefly, walking
             out)
You too!

Took three seconds after the elevator closed till I had the thought, "wait, wasn't that Kerry Butler?"
Took two more days to find out she actually lives in the building.

Kerry Butler, if you are reading this, I'm sorry I didn't get to tell you that you were awesome in Batboy. Other stuff too, but particularly Batboy.