It was a few years ago at one of those big nostalgia conventions in Chicago.

I was sitting on a stage with a couple of the guys, and the room was packed with people wearing olive drab and fishing hats.

A young man in the third row stood up, clutching a vintage script, and asked me a question that I’ve heard a thousand times, but it always makes me smile.

He asked, “Jamie, after all those years in the mud and the dresses, who was the hardest person to keep a straight face around?”

I didn’t even have to think about it.

I leaned into the microphone, and I told him that while Alan Alda was a riot and Mike Farrell was a prankster, the man who truly tested our sanity was Harry Morgan.

Now, you have to understand that when Harry joined the cast as Colonel Potter, we were all a little intimidated.

He was a legendary character actor, a real “pro’s pro” who had worked with everyone from Jack Webb to John Wayne.

He came in with this incredible discipline, and we weren’t sure if our usual brand of set-side chaos would fly with him.

But we quickly learned that under that stern, “no-nonsense” exterior was a man who loved a good joke more than anyone I’ve ever met.

The problem was that Harry could keep a straight face while the rest of us were falling apart.

We were filming an Operating Room scene late one Friday night, and if you’ve ever seen the show, you know those scenes were the most grueling.

It was Stage 9 at 20th Century Fox, and it must have been 100 degrees under those studio lights.

We were all wearing heavy surgical gowns, masks, and gloves, and we’d been standing over that “patient” on the table for six hours.

The fatigue was setting in, and when the cast of MAS*H got tired, we got dangerous.

Alan and Mike had spent the afternoon whispering in a corner, which was always a sign that trouble was brewing.

They had managed to sneak a very specific prop onto the set without the director or the producers noticing.

As we prepared for a high-stakes, dramatic close-up on Harry, I saw Alan wink at me from across the table.

The cameras started rolling, the lighting was perfect, and the room went dead silent.

And that’s when it happened.

The script called for Harry, as Colonel Potter, to reach his hand out and demand a surgical instrument with total authority.

He was supposed to say, “Hemostat!” and wait for the nurse to slap it into his palm so he could continue saving a life.

But Mike Farrell had managed to get to the surgical tray first.

Instead of a hemostat, the prop person—who was in on the joke—handed Harry a small, yellow, squeaky rubber chicken.

Now, in a normal world, an actor would stop the take, laugh, and we’d go again.

But Harry Morgan was not a normal actor.

Without breaking character for even a microsecond, Harry took the rubber chicken and held it with the same professional intensity he would use for a scalpel.

He looked down at the “patient,” which was really just a mannequin stuffed with foam, and he began to “operate” with the chicken.

The rest of us were paralyzed.

I was standing right next to him, and I could feel my chest beginning to heave because I was holding in a scream of laughter.

I looked over at Alan, and his eyes were watering above his mask.

The director, who was watching on the monitor, hadn’t called “cut” yet because he was so confused by what he was seeing.

Harry then turned to me, completely deadpan, and said in that iconic gravelly voice, “Klinger, this man is suffering from a severe case of poultry-itis. Squeeze the beak.”

That was the end of it.

The entire set exploded in a way I have never seen before or since.

I didn’t just laugh; I collapsed.

I literally fell against the side of the operating table, and the “patient” actually slid off the other side.

The camera operators were shaking so hard that the footage from that take looked like it had been filmed during an earthquake.

You could hear the sound mixers in the back howling through their headsets.

But the funniest part of the whole thing was Harry himself.

While the rest of us were doubled over, gasping for air and clutching our sides, Harry just stood there with that chicken in his hand.

He looked around the room with this expression of pure, feigned confusion.

He said, “What’s the matter with you people? We’ve got work to do!”

He kept the bit going for another five minutes, acting like the chicken was the most advanced piece of medical technology in the world.

He even tried to use the chicken’s feet to “suture” a wound.

By the time the director finally managed to stop laughing long enough to call a break, we were all physically exhausted from the humor.

We had to take a twenty-minute “sanity break” just so the makeup department could fix our faces.

We had all laughed so hard that our mascara was running and our surgical masks were soaked through.

That moment became a legend on the Fox lot.

For the rest of the season, you’d find that rubber chicken in the most unexpected places.

You’d open a drawer in the Mess Tent, and there it was.

You’d pull back the covers on a bunk in the Swamp, and the chicken would be waiting for you.

It even made an appearance in the background of a few shots, hidden behind a bottle of gin or tucked under a pile of laundry.

It changed the whole dynamic of the show for us because it proved that Harry wasn’t just our leader; he was our accomplice.

He told me later that he had seen the chicken out of the corner of his eye before the take even started.

He had decided right then and there that no matter what happened, he wasn’t going to be the one to break first.

He wanted to show the “young kids” how a real professional handles a farm animal in the OR.

Whenever I watch the old episodes now and I see Harry looking particularly stern or serious, I always wonder if he has a toy hidden in his pocket.

It’s those moments that made the show what it was.

We weren’t just actors playing soldiers; we were a family that relied on each other to stay sane in the middle of all that pretend war.

And sometimes, the only way to stay sane is to operate on a mannequin with a piece of squeaky yellow rubber.

I still have a picture somewhere of Harry holding that chicken like it was a gold medal.

It reminds me that even in the most serious jobs, there is always room for a little bit of nonsense.

Looking back, I think that’s why MAS*H resonated with so many people.

We weren’t afraid to be silly when the world felt too heavy.

It’s a lesson I’ve carried with me long after I hung up the dresses and the fatigues.

If you can’t find the humor in a long, hot day at the office, you’re just not looking hard enough.

Do you have a favorite memory of Colonel Potter that always makes you laugh?