We were sitting in a small, dimly lit studio in New York, recording an episode for my podcast, Clear+Vivid. My guest that day was an old friend, and as we started talking about the early days of MAS*H, I found myself looking at a black-and-white production still someone had left on the desk. It was a shot of the Operating Room—the OR—that sweltering, cramped set where we spent about half of our lives during those eleven years.

The sight of those surgical masks triggered something in my gut. It wasn’t the drama or the heavy emotional weight of the show that came rushing back. It was the absurdity. You have to understand that filming the OR scenes was a unique kind of physical and mental exhaustion. We were packed in there under hot studio lights, wearing heavy gowns, and trying to look like we were saving lives while reciting complex medical jargon that none of us actually understood.

To keep ourselves from losing our minds during those long hours, we developed a very specific, very warped sense of humor. We were like kids in a classroom trying to make each other laugh while the teacher’s back was turned. On this particular day, we were filming an episode where the tension was supposed to be at a peak. The script called for a high-stakes surgery, the kind where the characters are snappy, tired, and on edge.

Gene Reynolds, our producer and director at the time, was a stickler for the reality of the scene. He wanted the clinking of instruments and the focused silence of a real surgical unit. We had a medical consultant on set, a real doctor, who would watch our hands to make sure we weren’t holding the forceps like we were picking up salad. Everything was primed for a serious, Emmy-contending moment of television drama.

I was standing over the “patient,” and Wayne Rogers was across from me as Trapper John. We had been filming for hours. The air in the studio was stagnant, and the smell of the latex gloves was starting to get to everyone. I looked over at Wayne, and I could see that glint in his eye—the one that usually meant trouble for the production schedule.

We started the take, and the camera began its slow, dramatic crawl toward us.

The silence in the room was absolute, save for the rhythmic “clink, clink” of the metal instruments. I reached out my hand, masked and somber, and called out for a hemostat. It was a simple line, one I had said a thousand times. But as the nurse placed the metal tool into my palm, Wayne leaned in just a fraction of an inch too close.

In a voice so low it was almost a whisper—a voice meant only for my ears and not the microphones—he didn’t say his line. Instead, he made a very small, very wet, rhythmic squishing sound with his surgical glove. It was such a ridiculous, juvenile noise in the middle of this life-or-death operating sequence that my brain just short-circuited.

I tried to keep my eyes fixed on the “wound,” but the corners of my mouth began to twitch. I squeezed my eyes shut, trying to channel the image of a grieving family or a tragic sunset, but the more I fought it, the more the pressure built up inside my chest. I took a deep breath to deliver my next serious line of dialogue, but instead of words, a high-pitched, strangled snort escaped from behind my mask.

That was the end of the take. Once that sound left my throat, Wayne let out a muffled bark of laughter that sent his own mask billowing out like a sail. We both doubled over the dummy on the table. Gene Reynolds yelled “Cut!” but it was too late. The contagion had already spread.

The “nurse” standing next to me, who had been trying to maintain her professional composure, suddenly lost it and had to turn her back to the camera, her shoulders shaking uncontrollably. Then Larry Linville, who played Frank Burns and usually tried to stay in character to keep the discipline up, started making this wheezing sound like a teakettle.

Gene walked onto the set, looking frustrated, ready to give us the “time is money” speech. He opened his mouth to reprimand us, but then he looked at the two of us—two grown men in surgical scrubs, weeping with laughter over a squeaky glove—and he just stopped. He looked at the floor, shook his head, and then he started to chuckle. Once the director goes, the crew goes.

The cameraman actually had to step away from his rig because he was laughing so hard the frame was bouncing. We tried to reset. We really did. We took five minutes, drank some water, and fanned ourselves off. We got back into position. Gene called “Action.” I looked at Wayne. Wayne looked at me. He didn’t even have to make the noise this time. Just the memory of the noise was enough.

I opened my mouth to speak, and nothing came out but a silent, shaking tremor. We went through six takes like that. Every time the room got quiet, the absurdity of what we were doing—pretending to be heroes in a plywood room in California—hit us all at once. It was a total collapse of professional decorum.

The crew was leaning against the walls, wiping their eyes. The lighting guys were cracking up in the rafters. It became this legendary moment on set because it reminded us that no matter how heavy the subject matter was, we were a family, and families laugh at the stupidest things.

The funniest part was the medical consultant. He was standing in the corner, looking absolutely horrified. He kept saying, “You can’t do that in a real OR! You’d contaminate the field!” And of course, hearing him get so worked up about the “contamination” of a foam-filled dummy only made us laugh harder. We were essentially useless for the rest of the afternoon.

We eventually finished the scene, but if you watch that specific episode carefully, you can see that my eyes are incredibly red. People probably thought Hawkeye was just exhausted from the war, but the truth was I had been crying from laughter for forty-five minutes straight.

That was the magic of that cast. We worked harder than almost anyone in television at the time, but we knew when to let the pressure valve pop. If we hadn’t had those moments of absolute, uncontrolled silliness, I don’t think we could have told the stories we told for over a decade. You need the light to show the dark, and sometimes the light comes from a squeaky latex glove.

I still think about that whenever I’m in a situation that feels too serious or too tense. I think about Wayne’s eyes crinkling above that blue mask and the sound of twenty people losing their minds in a dark studio. It’s a good reminder that even in the middle of a “war,” you have to find a reason to break character every once in a while.

What is the most inappropriate moment you have ever burst out laughing?