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That would be interesting. The use of sarcaasm also seems to be a great way to foil these algorithms.

SarCaptcha:

1) This is a sentence.

2) This captcha is on this page.

3) This captcha is super awesome.

Autistics would fail this, no?

They're not real people anyway. [/sarcasm]

I've seen "choose the absurdity" before.

I don't get it. Knock knock...