Inseparable

"I am sad."

"Don't be sad. I'm here for you."

" Ha-ha. It's easier said than done. You ought to know that."

"Well its true, but I'm here for you, am I not?"

"Thank you."

"I said thanks, did you not hear me?"

"I heard you. And I'm sorry I took so long to reply. You see, it's not easy trying to catch up with you (and my breath) when you're making me stand on something that's always pulling us apart."

"Oh. Oh. Sorry."

"It's alright, I'm managing. You and breathing mean the same thing to me, anyway."

"How so? What kind of identical can we possibly be?"

"Without either of you, I'd be dead."

(story of the up & down escalators)