The end of Balance of Terror, when it fades to black with Kirk walking the corridors after talking to the newlywed widow. Its one of the more human moments of the series for Kirk.

No soliloquy, no profound meaning, just the ugly realization that it sucks to be the man in the center seat, sometimes.

__________________
The last time I felt a warm fuzzy feeling, I was informed by my doctor that it was just gas.