I get HTTP errors for various resources, and no styles or scripts are applied, which effectively makes the whole site unusable.
Meta does seem to be working fine, though.
Edit: Here's a log from Firefox Console. The relevant requests appear to be returning 403 Forbidden.
[10:28:39.766] GET http://stackoverflow.com/questions/19269438/is-there-a-way-to-call-member-function-without-or-operator/19827813# [HTTP/1.1 200 OK 917ms]
[10:28:40.929] GET http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js [HTTP/1.1 304 Not Modified 680ms]
[10:28:40.932] GET http://cdn.sstatic.net/Js/stub.en.js?v=e3d47b73fa12 [HTTP/1.1 403 Forbidden 612ms]
[10:28:40.935] GET http://cdn.sstatic.net/stackoverflow/all.css?v=87e1657c9db8 [HTTP/1.1 403 Forbidden 605ms]
[10:28:41.401] GET http://cdn.sstatic.net/Js/stub.en.js?v=e3d47b73fa12 [HTTP/1.1 403 Forbidden 347ms]
[10:28:41.753] GET http://cdn.sstatic.net/stackoverflow/all.css?v=87e1657c9db8 [HTTP/1.1 403 Forbidden 237ms]
Edit 2: It happened again. This time I screenshotted everything. The CAPTCHA actually does not appear to be the usual one with men dressed as robots. I had to scale the page down a bit drastically to fit onto one screenshot.
I'm posting this update a bit in the blind because the same error prevents those images from loading. Let me know if they weren't uploaded. Meta still shows no other symptoms.