Funny.
My son had some dental work done once. I wanted to watch. You know, to make sure the staff treated my son respectfully and didn't abuse him, since I've heard reports that not all dentists treat their patients well.
Wouldn't you know it, the dentist didn't let me sit back there while they did oral surgery on my anesthetized son. Huh. I wonder why.
(Actually, I didn't want to sit back there and I did trust the dentist. That part I was joking about. My son asked if I could be with him, though. But go figure, the dentist refused.)