Spock raised an eyebrow. "I am *not* Irish," he pointed out dryly. "I am not even fully Terran, to my great satisfaction."
"Doesn't matter," McCoy shot back promptly. "The whole ship's gotten into it. Everyone has at least something green on today but you!"
"I do not wish to be 'pinched'."
"Then add something green to your wardrobe!"
Spock stood, motionless. Then, his movements deliberately irritatingly slow, he reached down and undid his fly.
"Green enough for you, Doctor?"