I've again encountered one of these:
Now I know the Greek Economy is dwindling and I appreciate StackExchange trying to help them out by OCR'ing there scripts, but for our poor Western Keyboards, those letters are a bit far fetched.
Since I always resort to just typing
Q*zi, I don't think it's helping them anyway ;)
There captcha's risk throwing off some users who are trying to ask a question. Can we only offer captcha's in the Western alphabet?