The studio light in the podcast booth is a soft, warm amber, and Mike Farrell leans back into the leather chair with a comfortable creak. He is guesting on a show about television history, and the host has just asked him about the legendary camaraderie on the set of MAS*H. Mike smiles, that familiar spark of mischief lighting up his eyes as he adjusts the headphones.

He starts by talking about the grueling nature of filming at the Fox Ranch in Malibu. It was beautiful, sure, but it was also dusty and hot, and the days were incredibly long. To keep their spirits up, they didn’t just tell jokes; they lived them. They were a family, and like any family, they found ways to push each other’s buttons just to see what would happen.

The host asks if there was ever a time when the joking went a little too far, or if there was a prank that stood out above the rest. Mike chuckles and mentions that Alan Alda had just bought himself a brand-new Mercedes-Benz. It was his pride and joy, a beautiful piece of German engineering that he parked very carefully in the same spot every single morning.

Alan was always the professional, the leader of the group, and he was so delighted with that car. He’d talk about the precision of the handling and the reliability of the engine. Mike explains that, eventually, that level of pride became an irresistible target for the rest of the cast and the crew.

It started small. Mike and a few members of the transportation crew decided to move the car just a few inches every day. Alan would come out at the end of a fourteen-hour shoot, look at his car, and pause. He knew where he had parked it, but somehow, it was always slightly off-center or a foot further back than he remembered. He began to doubt his own memory, squinting at the pavement in the fading California light.

But then, Mike decided to take the psychological warfare to the next level. He realized that Alan was keeping a very close eye on his fuel economy. He was impressed by how many miles he was getting to the gallon. So, Mike started sneaking out to the parking lot during lunch breaks with a five-gallon can of gasoline.

He would quietly unscrew the cap and pour just a few gallons of gas into Alan’s tank, day after day. He didn’t tell a soul except for the crew members who were standing lookout. The goal was to make Alan believe he owned a miracle vehicle that defied the laws of physics.

Alan started coming to the set in the mornings, absolutely beaming. He would tell the guys at the craft services table that he had been driving all week and the needle on the fuel gauge hadn’t even moved. He was convinced he had bought the most efficient car in the history of the automotive industry.

The crew played it perfectly. They would nod and look impressed, asking him questions about the engine specs while holding back their laughter. Mike would just sit there, sipping his coffee, watching Alan descend further into a state of bewildered joy. It went on for nearly a month.

Alan was so confused by the car’s performance that he finally decided he had to take it to a specialist to figure out why the gauge was “stuck,” even though the car kept running perfectly. He was becoming obsessed with the mystery of his magical Mercedes.

And that’s when it happened.

Mike is laughing so hard now in the podcast booth that he has to take a moment to catch his breath before continuing. He describes the day Alan came into the commissary for lunch, looking completely defeated. He had spent his morning off at the Mercedes dealership, and he had a look of utter confusion on his face that Mike says he will never forget.

The mechanic had looked Alan in the eye and told him there was absolutely nothing wrong with the car. The gauge was working perfectly. The tank was full because, quite simply, there was gasoline in it. Alan had tried to explain that he hadn’t visited a gas station in weeks, and the mechanic had just looked at him like he was losing his mind.

Mike realized the moment had come to end the charade. He waited until the entire cast was gathered around the table, including Loretta Swit and Harry Morgan. The room was buzzing with the usual lunch-break energy. Alan was sitting there, staring into his soup, muttering about German engineering and the supernatural.

Mike leaned over and asked Alan how the car was running. Alan went off on a ten-minute rant about the dealership and the fact that he was apparently the only person in the world who owned a car that produced its own fuel. He was genuinely concerned that he was hallucinating his trips to the office.

At that point, Mike couldn’t hold it in anymore. He reached into his pocket and pulled out a small, crumpled receipt for five gallons of high-octane gasoline. He slid it across the table toward Alan without saying a single word.

The table went silent. Alan picked up the receipt, read it, and then looked at Mike. Then he looked at the crew members who were suddenly very interested in their sandwiches. The realization washed over his face in slow motion. He didn’t get angry; instead, he just put his head down on the table and started to shake.

The laughter that erupted in that commissary was enough to shake the walls. The crew had been holding this secret for weeks, watching their lead actor brag about his miracle car while Mike was secretly acting as his personal gas station attendant. It wasn’t just a prank anymore; it had become a piece of set lore.

The director and the producers were in on it by the end, and the “Miracle Mercedes” became the running joke of the season. Every time Alan would mention a problem with a prop or a script, someone would inevitably ask if he wanted them to go put some gas in it for him.

Alan eventually got his revenge, of course. He was a master of the long game himself. But Mike tells the podcast host that the reason that specific moment stayed with him wasn’t just because it was funny. It was because of the way Alan took it. He loved the craft of the prank as much as they did.

It spoke to the level of trust they had. You can only pull a stunt like that on someone you truly love and respect. If the set had been a toxic place, a prank like that would have ended in a lawsuit or a screaming match. On MAS*H, it ended with a round of drinks and a better story to tell at reunions.

Mike reflects on how those moments of levity were actually what allowed them to film the heavy, emotional scenes the show was known for. They needed that release. They needed to remind themselves that they were a team, a unit, and that they had each other’s backs—even if one of them was secretly messing with your fuel gauge.

He tells the host that even now, decades later, when he sees a silver Mercedes on the road, he gets a little itch in his hand to grab a gas can. It’s a permanent part of his brain. He wonders if Alan still checks his parking job three times before walking away from his car.

The host asks Mike if he thinks the show would have been as successful without that behind-the-scenes madness. Mike is certain it wouldn’t have been. That energy, that sense of play, it bled through the film. It made the friendships on screen feel real because the friendships off-screen were forged in the fire of ridiculous psychological warfare.

As the interview winds down, Mike gets a little more reflective. He mentions that as they get older, those stories are the things that keep the ghosts of the ranch alive. The scripts are archived, and the episodes are on reruns, but the feeling of standing in that dusty parking lot, laughing until your ribs hurt, is something that only the people who were there can truly understand.

He ends the story by saying that he and Alan still talk regularly, and every once in a while, he’ll just send Alan a picture of a gas station sign without any context. It’s their shorthand for a decade of their lives spent in the trenches of sitcom history.

It is a reminder that the best parts of any job aren’t the awards or the paychecks, but the people who make you laugh so hard you forget you’re working. And maybe, just maybe, it’s a reminder to always lock your gas cap when Mike Farrell is around.

The humor on that set was a survival mechanism, a way to bridge the gap between the fictional war they were portraying and the very real bonds they were building. It was a beautiful, chaotic, and occasionally expensive way to make television history.

If you had the chance to prank a coworker for a month without getting caught, would you be as dedicated as Mike was?