I remember sitting there in that small, dimly lit studio for the Archive of American Television, the camera humming quietly in the background.

The interviewer leaned forward, a look of genuine curiosity on his face, and asked me something I hadn’t really thought about in years.

He wanted to know about the transition from playing Bill Gannon on Dragnet to Sherman Potter on MAS*H.

He asked if it was difficult to maintain that crusty, professional military exterior when I was surrounded by a bunch of absolute lunatics like Alan Alda and Jamie Farr.

I couldn’t help but chuckle because, the truth was, I was often the biggest lunatic of them all once the cameras stopped rolling.

But there was one specific night that always stands out when I think about the sheer, unadulterated joy of that set.

It was a Friday, which on our schedule usually meant we had been working for fourteen hours and were moving into what we called the “delirium zone.”

We were filming an Operating Room scene, which were always the most grueling parts of the show.

The set was built inside a tent under these massive, heavy studio lights that pushed the temperature up toward a hundred degrees.

We were all wearing those heavy surgical gowns, the masks, and the latex gloves covered in corn syrup “blood.”

In the scene, Colonel Potter was supposed to be in a particularly foul mood because the 4077th was being overrun with casualties.

I had this long, technical monologue about a patient’s internal injuries while I was working alongside Mike Farrell and Alan.

The script was dense, full of medical jargon that was a nightmare to memorize when you were exhausted.

I had been practicing the lines all day, making sure I sounded like a man who had been a surgeon for thirty years.

The director, Burt Metcalfe, called for quiet on the set, and the tension in the room was palpable as we prepared for the take.

I looked down at the “patient,” feeling the weight of the character, and prepared to deliver my sternest lecture yet.

And that’s when it happened.

Instead of the complex medical term for a ruptured spleen, what came out of my mouth was a high-pitched, completely nonsensical squeak that sounded like a deflating balloon.

It wasn’t even a word; it was just a strange, rhythmic noise that seemed to hang in the hot, stagnant air of the OR.

For a split second, the entire room went dead silent.

I saw Mike Farrell’s eyes crinkle above his mask, and I knew I was in deep trouble.

I tried to recover, clearing my throat and straightening my shoulders to try the line again, but as soon as I looked back at Mike, he let out a muffled snort.

That was the end of it.

I completely lost my composure.

I started laughing so hard that my surgical mask began to suck into my mouth with every gasp for air.

Now, you have to understand that when I started laughing, I didn’t just chuckle; I had this high-pitched, wheezing laugh that was incredibly infectious.

Alan Alda, who was usually the professional anchor of the scene, looked at me, looked at the “patient,” and then just doubled over, leaning his forehead against the surgical table.

The director yelled “Cut!” but it was far too late.

The laughter had already jumped from the actors to the crew.

The camera operator, a big fellow who usually took his job very seriously, actually had to step away from his rig because the camera was visibly shaking.

We tried to reset, to get back into the “serious” headspace of a war-torn hospital, but the damage was done.

Every time I opened my mouth to start the monologue, I would catch a glimpse of Mike Farrell’s eyebrows twitching, and I’d go off again.

It became a physical struggle; my ribs were actually aching from the effort of trying to stay quiet.

We went through four or five retakes, and each one was a disaster.

One of the nurses—who was played by a real-life nurse acting as an extra—was laughing so hard she had to go to the makeup trailer because her mascara was running down her face.

Burt Metcalfe eventually walked onto the set, shaking his head with a grin, and told us all to take twenty minutes to walk outside and breathe.

He knew there was no point in fighting it once the “MAS*H giggles” took hold of the “Old Man.”

I remember walking out of the soundstage into the cool night air, still wearing my bloody gown, just leaning against a trailer and wiping tears from my eyes.

It was a legendary moment because I was the one who was supposed to be the “rock,” the veteran actor who kept everyone else in line.

But in that moment, I was just a man having the time of his life with my best friends.

The crew never let me hear the end of it; for weeks afterward, whenever I’d walk onto a set, someone would make that same squeaking sound.

It became a running joke that if the “Colonel” was too stern, someone just had to squeak to break the tension.

That was the beauty of that show; we dealt with such heavy, dark subject matter every single day that these moments of pure, ridiculous failure were our survival mechanism.

It reminded us that despite the gowns and the fake blood and the scripted tragedy, we were a family that truly loved making each other laugh.

Whenever I see a rerun of an OR scene now, I don’t look at the surgery; I look at our eyes above the masks to see if any of us are about to crack.

Most of the time, if you look closely enough, you can see the telltale crinkle of a hidden smile.

It was the hardest job I ever had, and easily the most fun, because we never took ourselves quite as seriously as the characters we played.

I still miss those long, hot Friday nights and the sound of that crew laughing along with us.

If you could spend one day on the set of any classic TV show, which one would you choose to see the bloopers in person?