The whole Intoxication Ensues sequence in "The Windbreak War". In the end, just this once, even Margo gets the joke. (Which makes it double as a Crowning Moment of Heartwarming.)
And even more of a CMoH in that the amusing event that sets Margo off at first horrifies the other three (afraid that Margo will blow up), until they see that Margo doesn't mind and begins laughing hysterically. They follow suit and let themselves laugh as well.
When they're trying to get the harvest in ("Backs to the Wall"), Margo comes to help in bright yellow waterproofs. And then proceeds to pick runner beans. One at a time.
And then, goaded by Tom's ingratitude and Barbara's reverse psychology, tries to show that she is not "weak and feeble" by swinging a heavy sack onto her shoulders, overbalances, and collides with the other three bringing them all down in the mud.
Jerry's reaction to the plant experiment in "I Talk To the Trees". He goes home to escape the insanity. On his way out....
"Goodbye table. Goodbye chair. Bye curtains! Hello garden! [frolics away down the path]"
Everyone's stunned reaction to the amdram society's production of The Sound of Music. We never get to see it, but the reactions, Jerry, Tom and Barbara's post-show observations, not even being able to muster faint praise (and the Mayor shutting the whole thing down after one performance) speaks for itself.
