Dreams
OK I wasn't a die hard fan of the show, but I was into it when in the mood. One episode of MASH in particular that stood out for me, came in a later season (Season 8, Ep 22). It was titled "Dreams." This was one of the more dramatic/"no laugh track" episodes that wandered from its usual comedic storylines. I guess leave it up to viewer's opinion, because I was never a fan of the few "dramatic" turns that some episodes took, but in MY opinion, this was one of the best made episodes, even venturing into eerie and disturbing and "nightmarish" (which is appropriate since the episode centered on nightmares of those in the unit.
If you're a fan of the show but haven't seen this episode, please look it up and watch it. It's very effective, almost tearful.