"Careful with the ship, Spock. She's brand new." - Eyebrow -
That was his left eyebrow.
Confirmed - just checked it.
Has someone written a doctorate on Vulcan eyebrow language yet?
Like left eyebrow 10 degrees means bored. right eyebrow 20 degrees amused, eyebrow in hair - you are being illogical Dr McCoy etc.
Whats the effect of being mono-eyebrowed?