If you got that CentOS page that means someone did a system update and the /etc/httpd/conf.d/welcome.conf came back. That page tends to get cached at the cloudflare service. Everyone won't see it, since there isn't one object cache there, but but but.... I think since noone else got it, your pooter just got it at the right time and decided it would stick with it for sometime.
Crispin should just remove that problem from happening again with an 'echo #OhMyNick > /etc/httpd/conf.d/welcome.conf '