What the heck?
Well, if it is a WordPress blog where you were trying to leave a comment, then this most likely means your ip address has been "akismeted!" Your comment went straight to the spam comments section. That means some previous blog owner labeled one of your comments as spam, and hit that "Mark as Spam" button, and that sent you to Akismet H*ll.
How to check if your IP is living in Akismet H*ll
1. Go to one of your own word press sites (it must have akismet plugin activated for this test) and be sure you are NOT logged in. Leave a comment on your own blog.
2. Log into the site and go to the dashboard. Find your comment. Is it marked as a spam comment? If so, then your IP is in Akismet H*ll.
How to get out of Akismet H*ll
1. Wait it out - takes three to six months of not commenting and then you will suddenly be able to comment again
2. Use a proxy when commenting
It has happened to all of us. It just takes one zealous wordpress blogger to hit that "Mark as Spam" button. And you won't get a notice that it has happened. That white blizzard screen is your unofficial notification.