Word Verification
Nowadays there is word verification for almost anything and everything on the net. Spams, abuse of automated scripts and other problems have made it necessary, but its become like a cat and mouse chase. While OCR softwares (those that recognize alphabets and numbers from pictures) are getting smarter, the word verification engines are using more and more cryptic ways of writing them.
People themselves have some trouble identifying it correctly sometimes, which often happens when commenting on blogspot blogs. I don't see the method viable after 10 years.