I was sitting in the recording studio for a podcast recently, just talking about the craft of writing and directing television.

The host, completely out of nowhere, pivoted away from the serious acting questions.

He leaned into the microphone and asked if there was ever a day on the MAS*H set where a practical joke nearly derailed an afternoon of filming.

I had to sit back in my chair and laugh, because the answer was an overwhelming yes.

If you put a group of actors in a soundstage in California, dress them in wool army fatigues, and tell them to pretend it is freezing cold in Korea, people are going to get incredibly stir-crazy.

Wayne Rogers and I were without a doubt the worst offenders.

We loved Larry Linville, and we absolutely adored Loretta Swit, but our absolute favorite target for on-set mischief was McLean Stevenson.

McLean played Colonel Henry Blake, and he had this incredibly unique, nervous comedic energy that was just begging to be messed with on a daily basis.

There was a specific scene we were shooting very early on in the series.

It was set in the Swamp, our living tent, and it was supposed to be a highly emotional, somewhat angry exit for McLean.

His character was fed up with the antics of Hawkeye and Trapper.

The stage directions called for Henry Blake to storm into the tent, deliver a blistering reprimand, aggressively grab his heavy canvas duffel bag off the floor, and storm out into the compound in a huff.

Wayne and I looked at that canvas bag sitting there during rehearsal.

We looked at each other.

And we knew exactly what we had to do.

While the camera crew was adjusting the overhead lighting for the final take, we quietly grabbed about eighty pounds of solid lead stage weights.

We snuck over and slipped them right into McLean’s prop bag.

The director finally called for action.

McLean burst into the tent, delivering his dialogue with absolute perfection, his face flushed with theatrical, authoritative anger.

He marched straight over to the canvas bag.

He reached down, ready to aggressively yank it off the dirt floor and make his dramatic exit out the door.

And that’s when it happened.

McLean grabbed the thick canvas handles and violently pulled upward with all his might.

Instead of the bag flying up into the air and effortlessly slinging over his shoulder, it did not budge a single inch.

The sheer force of his upward momentum, met with the immovable object of eighty pounds of solid lead, caused a spectacular physical reaction.

McLean’s arm jerked down so hard that his entire right shoulder practically dropped to his knees.

His body spun around like a top that had just been aggressively yanked off its string.

He let out this bizarre, high-pitched gasp that sounded absolutely nothing like a commanding officer of the United States Army.

He stumbled backward, completely losing his footing, and collapsed right onto Trapper John’s army cot.

For a split second, there was total, bewildered silence inside the Swamp.

Wayne and I were standing there in our bathrobes, biting the insides of our cheeks so hard they were bleeding, desperately trying not to break character.

The camera was still silently rolling.

The director, who was watching from a chair behind the monitors, had no idea what had just occurred visually.

He yelled out angrily from the darkness, asking McLean why he had completely ruined the dramatic timing of his exit.

That was all it took.

Wayne completely lost his composure.

He doubled over, laughing so hard that he physically fell onto the dirt floor of the soundstage.

I immediately followed, grabbing my ribs because I was laughing so violently that I physically could not breathe.

McLean finally realized what had happened to his prop.

He looked down at the bag, looked at us writhing on the floor in tears, and angrily put his hands on his hips.

He stood there for a moment, trying his absolute hardest to maintain that furious Henry Blake persona.

He pointed a shaking finger at us and started shouting every curse word in the book, calling us absolute menaces to the acting profession.

But McLean was a comedian at heart.

He simply couldn’t stay mad for more than ten seconds.

The corners of his mouth started to twitch.

His shoulders started to uncontrollably shake.

Within thirty seconds, McLean was laughing just as hard as we were, to the point where he had to sit back down on the cot because his legs completely gave out.

The sound mixer ripped his headphones off because our collective laughter was blowing out the audio levels on the entire stage.

He came storming out of his audio booth, demanding to know what kind of explosion had just happened in our tent.

The production crew, who had been working a grueling fourteen-hour day, finally caught on to what we had orchestrated.

Once they realized the duffel bag was filled with stage weights, the entire camera department started cracking up.

The lighting grips were leaning against the light stands, actively wiping tears from their exhausted eyes.

The primary camera operator was shaking so badly from laughing that the lens was literally rattling on the wooden tripod.

We had to completely shut down production for over twenty minutes just to recover.

Every time the director called for actors to take their places, McLean would look over at that duffel bag and just start uncontrollably giggling.

He flatly refused to do the scene again until Wayne and I personally carried the bag outside and emptied the heavy lead weights onto the ground.

He made a huge theatrical show of supervising us, crossing his arms and tapping his foot while we hauled the heavy metal out into the California heat.

It became an incredibly famous story around the studio lot.

For the rest of his time on the show, McLean never fully trusted a single prop that was handed to him by a crew member.

If a scene required him to casually pick up a coffee cup, he would gingerly test the weight of it first, just in case we had somehow managed to fill it with solid cement.

If he had to quickly open a door for a scene, he would brace his entire body, assuming Wayne and I had secretly nailed it shut.

Which, to be completely honest, we actually did end up doing a few months later.

Looking back on those years, those moments of absolute chaos were genuinely necessary.

We were dealing with incredibly heavy subject matter on that television show, constantly balancing light comedy with the genuine tragedy of a war zone.

We were working exhausting hours, far away from our families, trying our hardest to produce something culturally meaningful.

The practical jokes, the ruined takes, and the brief moments where we laughed until we couldn’t breathe were the only things that kept us functionally sane.

It reminded us that underneath the uniforms, we were just a family of actors, getting paid to play dress-up and make people smile.

And nobody made us smile quite like McLean Stevenson.

I still think about that afternoon every time I see a green canvas duffel bag.

Do you have a favorite hilarious memory of McLean Stevenson from his time on the show?