If they are really insistent on some technical detail, I usually created a StackOverflow question based on their request and show them all the comments telling how stupid that idea is.

My favorite Codeless Code: The Purple Beggar.

…

The monk opened his laptop. “Five separate posters have each called me a blithering idiot and offered a simple solution to my problem, which they claim to have tested on their own systems.”

Yishi-Shing nodded. “My walk once took me past a beggar whose sign read, You do not DARE throw coins at ME! His body was purple with bruises but his bowl was always full.”

(before you spend too much time reading them, remember that there are mouseovers on the images… so you don’t have to go back and read them again)