Actually for my third example is the first movie. Spock's death scene with the shield between Kirk and Spock is quite powerful.
As well as McCoy openly crying at his funeral...
Or his lines in ST:III...
"I'm gonna tell you something that I... never thought I'd ever hear myself say. But it seems I've... missed you. And I don't know if I could stand to lose you again."
...which of course, wasn't a big revelation to the rest of us, but it was touching hearing McCoy tell Spock that, even if Spock wasn't quite all there.