"Look sir, here in the scrawl at the margins is the answer you just said was right"
"Yes Dylan, but this was a 1 mark question. Part of getting the mark involves putting the answer inside the space provided."
I highly doubt the science teacher marked me wrong for "dumping", though. He had every opportunity to explain that to me after I got my exam graded and I asked him about it. Then he had the opportunity to explain that face-to-face with my parents. He did not do so. He said that while I got the answer right, he was "mad", thus the mark against.
Besides, notecards were not allowed for any part of the exam, and I wrote my answer from memory. I think it was clear that I knew my stuff pretty well and was not "dumping" a bunch of bullshit onto the science teacher.
There was no indication before taking the exam that I would be punished for hurting his apparently-sensitive feelings while giving the correct answer (as he agreed I did). If there were, I certainly would have chosen a different medium for proving my command of the material.
Grading is boring, tedious, and quickly wears down one's enthusiasm. The words of M Bison come to mind: "For you, the day Bison graced your village was the most important day of your life. But for me, it was Tuesday."