Suzie and I were filled with questions for our poor instructor...

One I never did ask him was:
"So, if SCUBA stands for self CONTAINED underwater breathing aparatus, what does SNUBA stand for?... scuba NEWBIE underwater breathing aparatus?!"

But he definitely had his hands full with us.

Fortunately, the others didn't demand so much of his time -- either they'd done it before, or they were already adept at SCUBA diving and didn't need much "instruction".