The most ignorant client is the one requiring you to build his crapsite on WordMess despite of you showing him the glory and beauty of a proper CMS which has a brain-amputee-friendly back-end.
Some people just want and need constant pain on their servers.
His reason to prefer WP:
"I know how to use it."

War, war never changes...

Not a rant, but an argument between my colleagues and I over an erroneous form in a nutshell:
Them: -insert xyz deductions-
Me, an intellectual: The page is being redirected before the form processing finishes
Them: Buuuuullshit, how can that be?
Me: JavaScript.

15 minutes later, I emerged victorious. How? Because JavaScript.