In the midst of reflecting on Fatherhood, the concept, and which came first -- the chicken or the egg, the paradox, and things like that, my dad walked into the room, and we both started laughing hysterically, because, turns out, the joke is riotusly funny. And, he "got it," and I got it, and we laughed together about it.

He stood at the doorway laughing. He didn't come in, and I don't recall seeing him again during that first time admitted for this disease; though, I was moved to a private room shortly after that -- on the smoking side of the ward -- stage-left of the nurses station.

I didn't smoke at the time; never thought to. My dad, after all made his career as a pulmonologist, a lung doctor.

The unit was shaped like a dumbell -- two round large living spaces with couches, books, a TV and recliners; and, the windows were oval. The hospital building had likely been designed by Frank Lloyd Wright, it being a few blocks from the Water Tower.

Many years later, fully medicated and adhering to the available treatments with religious zeal for more than a decade, it dawned on me that, while I was laughing -- busting a gut over that joke -- my dad had been weeping, not laughing. He had, likely come straight from the airport that afternoon. The thought came while I was convalescing, yet again, after another in-patient stay. He was around that day, it being that "other" weekend when another doctor covered for him and he had a couple of days not on call. It dawned me listening to music coming from his study that for him the moment was one of tragedy instead of comedy. So, I went to his study, and I asked him: "That day in the hospital ... you were crying, right?"

He replied flatly: "Yeah."

We never spoke about it again since.

I had only seen him cry once before -- the moment he realized his dad would be dead -- iminently. That day at the hospital was the second and last time.

The only joke I can recall my dad ever telling me went like this:

He turned and said, "Son. I'm on a new diet."

We were sitting in the lobby of the hotel, waiting for my mother to come down, having a beer before venturing into dusk for a stroll to that restaurant she had had a hankering for since their last visit to New York City.

"Atkins?" I said.

"No. It's the chicken and bread diet."

"How does that work?" I asked.

He maintained a straight face. We were talking in spanish. The joke only makes sense if it's said in spanish, but the punchline loosely translates into english as this:

"You move one thigh over here; and the other thigh over there ... ." He clenched both fists and repeated quickly the word for bread in spanish: "Y Pan! Pan! Pan! ... ."

His eyebrows arched viscouly and he went into horse paroxysms of wicked laughter. So did I.

It's an onomatopeya, pan -- bread. It was funny, and he's still on a diet, but not, exactly, the same one. People don't change -- not really.