Good Luck on your CFI/II. I'd have to say the one ride that always sticks in my mind is my Private. (I guess that's called The Law Of Primacy).
My CFI test was done with this 68 year old examiner. Sharp as a tack.
We did a full day of oral, and a two hour practical. The oral was done on a Friday. At the end of the day, he said we'd continue the oral on Monday, followed by the practical test. He asked that I prepare ground lessons on two specific helicopter manuevers. He emphasized that I needed to use and bring all available references regarding those two lessons.
To make a long story short, I looked them up in every FAA publication, and believe me I had them all. Could not find anything except a short paragraph. On Sunday, I gave up, and decided to check my email. While I was on the net, I did a search on those two subjects and found two detailed articles written by helicopter kit builders. I printed them and brought them with me on Monday.
First thing the Examiner askes me is the two ground lessons and my references. I showed him what I had off the net. To my surprise, he tells me that I passed my oral, and he did not require me to give the ground lessons. He said he picked those two subjects in particular because he KNEW that there was not a lot of detail about them in the FAA publications. I had satisfied him that I was resourceful and was able to find answers to student questions and prepare well for lessons.
The practical was no problem.