This isn't a "client" issue exactly, but it meets the level of stupidity I've seen displayed by many of the clients mentioned on this page.
A friend of mine is a police officer, and told me this story. He found some kids sitting in a car at the high school parking lot. He approaches to see what's up. It's night time and he's shining a flashlight in their faces, to check out their eyes. He asks "are you using any drugs tonight?" They respond no of course. Then asks the driver "so why are your pupils so dialated?" and the driver responds.. "well officer... It IS dark out and you ARE shining a bright light in my eyes."
Sir, get out of the car please.