SCOTT: What is it?
MCCOY: It's a diluted theragen derivative.
SPOCK: Theragen? A nerve gas used by the Klingons.
SCOTT: Aye. And deadly, too. What are you thinking of, Doc? Are you trying to kill us all?
SPOCK: If I remember correctly, it caused fatality only when used in pure form.
MCCOY: That's right, and in this derivative, mixed with alcohol, it merely deadens certain nerve inputs to the brain.
SCOTT: Oh, well, any decent brand of Scotch will do that.
MCCOY: One good slug of this, and you can hit a man with phaser stun, and he'd never feel it or even know it.
SCOTT: Does it make a good mix with Scotch?
MCCOY: It should.
SCOTT: I'll let you know. (leaves with the remaining contents of the flask)