According to most captchas, I am a computer...

or so it seems....captchas at a bunch of places have become so distorted that I can barely read them myself. Its a good thing that some have a button that says "click to refresh" or something like that and create a new image.
Are they trying to weed out computers and OCR schemes, or just confuse the hell out of me? I have quite a lot of experience in OCR systems (as a user in large volume digitization projects) and can tell you that captchas could be a lot easier and computers would still not be able to read them...