Here's some of the captcha codes I encountered on a blog round last week. (Captcha stands for Completely Automated Public Turing test to tell Computers and Humans Apart. Incidentally rhymes with "gotcha!")
Seriously, these things make my monkey crazy. The ones on Blogger are the worst.
If you don't want to drive your frogs mental, you can either (a) turn on moderation so you have to check the comments before posting them, or (b) accept the Anonymous computer spam and delete it. If the commenter isn't signed in, and signs with the name "Anonymous", Blogger will send them to you to decide whether to post or not, and anything else will go through. I have an email filter so they go into one folder, and then I automatically delete them all.
Captcha codes are devil's spawn, yo.