Mr. Laser Beam wrote:
Here's one. In the actual film, it was spoken in a foreign language. I'm here translating it into English.
"I'm not crazy!...There it is.
That's Chekov remarking on the security alert appearing on his console towards the beginning of The Search For Spock, just after they arrive at spacedock. He says it to Scotty (in Russian) when he goes over to Chekov to check what's going on.