yes it is Bob!
I think it's Bones to Spock in 4 about making guesses.
Sorry but it's my turn to tell you you're incorrect. (Although you may be, but it really isn't when I am meaning)
Technically, he is right. That was bones to spock in 4. It was also spock to Saavik in 2... although in TWOK the line was "Nobody's perfect, Saavik." And in 4 McCoy prefaced the line w/a trademark "Well..." nothing like a DeForrest pause :-)
There's no technically about it, theoretically he may be right as it is said in Voyage Home aswell as when I was meaning it in Wrath of Kahn, so as you said it, technically you are right.
Also, if he can be allowed to have a wrong quote and stump people, more ambiguous quotes can be allowed as well.