Deep Spirits

So, my son and I are coming home from school... (no jokes about he and I being in the same grade...ha ha ha) and in the gutter there is a purplish pinkish liquid that travels about four or five car lengths.

I point to it and ask: "Oooh what is that?"
Christopher: "I don't know... paint."
Ryan: "Paint huh? Or maybe it is alien blood?"
Christopher: "Or vampire blood."
Ryan: "Nah! If it were vampire blood it would just burn up in the sun light."
Christopher: "Yeah! Maybe, the vampire burned up and his blood is running in the gutter."
Ryan: "I don't think so... I think the blood would burn up too and be dust or ash like Mama's cigarettes."
Christopher: "Yeah... it's probably alien blood then."
Ryan: "I think so too."
Christopher: "You know what that means?"
Ryan: "What?"
Christopher: "That there are aliens around us!"
Ryan: "I know... they're all over the place!"
Christopher: "Yeah... that guy could be one."
Ryan: "Yeah... I could be one."
(Christopher looks at Ryan suspiciously)
Ryan: "Maybe your Mother and I are aliens..."
Christopher: "Yeah, and you just don't know it..."
Ryan: "Or maybe we do know it...?"
(the sound of gears and thunder are flowing from Christopher's head)
Ryan: "After all... what is an alien?"
Christopher: "Something that is not from here...?"
Ryan: "I'm not from here."
( a smile and a look of realization appear)
Christopher: "Yeah, you are from America."
Ryan: "Your Mama's not from here."
Christopher: "That would mean I am an alien too..."
Ryan: "I don't know... does it? You were born here..."
Christopher: "So, I am part alien part human!"
Ryan: "I don't know... if you go swimming in a lake are you an alien there? You can't even breath the air in the lake although the fish can."
Christopher: "Yeah, so if I am in the water where I was born I am an alien."
Ryan: "I don't know... are you?"

And the banter continued until we reached the door...

Boy, does this type of conversation bring back memories....wonderful, playful and lighthearted memories! Thank you for sharing....sharing is caring and I love it!

In Beckett’s (1952) Waiting for Godot,Vladimir and Estragen have the following conversation:

Vladimir: I’m curious to hear what he [Godot] has to offer. Then we’ll take it or leave it.
Estragon: What exactly did we ask him for?
Vladimir: Were you not there?
Estragon: I can’t have been listening.
Vladimir: Oh… nothing very definite.
Estragon: A kind of prayer.
Vladimir: Precisely.
Estragon: A vague supplication.
Vladimir: Exactly.
Estragon: And what did he reply?
Vladimir: That he’d see.
Estragon: That he couldn’t promise anything.
Vladimir: That he’d have to think it over.

With all respect for the text above (?), I think that your dialogue with Christopher is better.
You could name it Waiting for Aliens...