Originally Posted by MikeSmoke

Usually I try to be as polite as possible. Once though, I had a guy in his late 70s who'd been a problem for years - he'd recently upgraded from WebTV to a PC, and insisted that he couldn't stream videos on my VOD system because my entire system was broken. I made several offers to help him troubleshoot his computer and figure out the problem - and he not only cursed me out because obviously my system was broken and I had no idea what I was doing - but then went on messageboards to do the same. He became a laughingstock on the messageboards, and I sent him an email thanking him for his past business, and instructing him NEVER to do business with me again - telling him that any attempts to join any of my sites would be refused and any DVD orders through the mail (because he refused to order online) would be returned unopened. Haven't heard from him since