Well, I'm a long way from having real clients, but I have a theory that PTO parents are worse. I had to light "American Idol" in the high school theatre for an afterprom activity. I had parents coming up to me asking if we had any lights that simultaneously drop gold glitter. They also wanted our lights to move in rhythm to the music, and considering we're a humble theatre of nothing fancier than source fours. I was ever so sad to dissappoint them.
I have a director that says that all the time she has no clue how to do lighting. If you bright the light down she will complain that you can see the person on stage. It goes back and forth untill we are on to the next seen.