I've known people who had to take the oral exam a few times before they qualified for water immersion.
My three sessions were funny. The first was with my bookstudy conductor, a very grandfatherly, gentle man. I could have said that Ba'al is the name of the true God and he would have smiled and nodded his head.
The second was with an elder who my father helped bring into the faith. He skipped half of the questions, saying: "You know this stuff, blah blah blah."
The third was with the PO, definitely the Nazi-type. He made sure I didn't just give rote answers, but that I thoroughly understood the material. After the standard questions were finally over, he added some of his own.
(this was in 1989)
"If George Bush walked through that door into this room, would you stand up?"
Since we didn't stand for the national anthem, and this was a very strict JW elders, I said No.
"YES, YOU WOULD STAND UP FOR THE PRESDIENT!"
"Now, if Jack Kemp [HUD secretary at the time I believe] walked into this room, would you stand up?"
Now I'm figuring I should say yes, so I say Yes.
"NO, YOU DON'T NEED TO STAND FOR HIM!"
So now I'm thinking, PLEASE don't ask if I should stand up for Nancy Reagan.
Well, after that, he reached over, shook my hand, said "Congratulations" and whisked me out of his house.
What made it more embarrassing was I had locked my car keys inside my car so I had to go back, ring his doorbell and ask for a coat hanger. LOL